Ok, I really hope it's not a kind of definitive compatibility issue.
I'm unplugging my hdd, I'll plug it to my laptop and format it into NTFS, and will do too your suggested check.
After that (and reading that article), I'll plug it again in my comp' and ttry again to install.

Edit Checking this right now.

Edit 2 : I can see my hdd at AHCI Port0, and my "onboard sata controller" is on "enabled" and "onboard sata mode" on "enabled". Is it good ?

So I tested it, here is the result :
Bytes Per Sector : 512
Bytes Per Physical Sector : 4096
And I formatted it into two partitions (NTFS), I'm putting it back in the comp', and we'll see if magic happens.

Edit : Nope, a clean install still doesn't work.
But I have a good news : in worst emergency-desperate cases, my set of recovery dvds seems to maybe. So I think it's due to this UEFI thing, who is messing since the beginning of my issues. So, I'll try to find a way to avoid UEFI if possible to do a clean install (option preferred). And if not (or if it's way too much complicated)... well I'll try recovery dvd and pray :/
Again, thanks all for all your help & support :)

Mm.. so that's an Advanced Format 512e.

According to this [url=MS page]https://msdn.microsoft.com/en-us/windows/compatibility/advanced-format-disk-compatibility-update[/url], Windows7 to work needs SP1 minimum (or KB982018).

Is your Win7 >= SP1?

I'm out of ideas..

Okay, on final discovery, it seems that if I switch the "onboard sata mode" from AHCI to IDE into bios, I can do the clean install. So nothing to do with UEFI apparently :)
And of course, after the clean instal, you have to switch back to AHCI through registry & maybe bios again.

I'll look at that tomorrow though, it's very late !

Yep, it's Win7 SP1 64Bits
Well, we talked a bit with ariaspi and he may have found a way : see my previous post concerning AHCI/IDE.
Thanks a lot for helping, I'm repeating myself but I'm very grateful :)

Weird.. maybe Win7 didn't have Sata drivers compatible to your HDD, so using the old standard worked.
Now that I think of it, I remember I actually slipstreamed various SATA (+USB3) drivers to a custom install..

. Ok, glad that you succeeded! :)

If you end up in that situation, it's probably time to upgrade the storing space or do some thorough cleaning, uninstalling and backups on external drives.

Yeah, that needs some planning beforehand, but usually 120 GB is enough for any Windows. Most SSDs are actually that size. Temp files and restore points should be cleared regularly. I usually do that before defragging and then do a manual restore point after it's done.
You mean this folder? I deleted that after every update without a problem. How much it takes on your drive?

That's normal, because you don't actually move the files on the same partition, but just assign them to other folders.

As above, time to upgrade, clean/uninstall, do backups. Yup, those utilities usually need 10% free space.

Well, that's entirely the fault of those who made the small partitions and today's drives are not exactly small at 1TB and more.

Yup, to each his own. Unfortunately, I haven't delved into Linux yet, but on Windows I disable the swap and hibernation files, so that's around 30 GB gained. Of course, that depends on how much RAM a system has.

Yep that worked ! :D
So, I just installed windows with success, a clean install :) Of course, I followed this explanations to put ahci back (a simple regedit, and after that the parameter to change in the bios).
I already installed the nvidia driver, and now I'm trying to install the drivers, kaspersky free, and after, the windows update.
For the drivers, I'm beginning with the dvd that I burned when my dying drive was still alive. After that, I'll try the automated software(s) :) *crosss fingers for everything going well*

Edit : okay. So I installed several drivers with my dvd. After I tried to use DriverPack Solution as suggested but I got a bunch of things not installing, and it was taking a long time. But it's certainly because of me, I shouldn't have tried to install kaspersky in the same time XD (or maybe it was because there wasn't any basic driver) So... I rebooted it a bit hardly because while shutting down, it was stuck on the "closing windows" screen with no disc activity at all. I restarted, restored at a point prior launching the utility, no issue. I then tried Slimdriver utility (suggested [url=https://www.gog.com/forum/general/my_computer_need_help/post33]here) : it seems to be running fine :) I've installed only very few drivers for now and rebooting regularly to not have a bad surprise. I'll certainly try DriverPack Solution and maybe Snappy Driver installer (suggested here) if I've got the motivation. But not sure for tonight, I'll certainly finish tomorrow :P

Note : That's so strange to not have all the useless softwares pre-installed with a Windows installation ! And my comp' start so fast ! :D
Are there any things/softwares I should think to install ? (I've the feeling of a "naked" windows and I don't know if there wasn't any usefull software pre-installed sometimes XD)

Congrats on your new Windows. :)
Beside the ones already mentioned in this thread, my all time favourite (I feel crippled using a computer without it) - Total Commander. You probably already use CCleaner from Piriform and the rest of their tools.

and/or [url=https://sourceforge.net/projects/mpcbe/]MPC-BE, VLC
and [url=http://www.rarlab.com/]WinRAR
Core Temp and Open Hardware Monitor
MediaInfo - if you need info about the codecs of your video and audio files
SUMo - to check for updates of your software
There's a ton of useful little tools at NirSoft.

Yaaaay ! :D And thanks again for all the help !
Almost everything is running fine :) I still need to try some particular old games which may be problematic but I'll see that later ;)
Oh btw, I wanted to ask you : I'm using something like this with two PS2 Dualshock controller. But sometimes -fortunately really not often- they disconnect in game due to rumble : I think it's the USB2 port who may not have enough power. Do you think a usb Y-cable could solve that ?
It seems pretty obscure to me :P What is this useful for ?
Yep :)

Damn, 500 mA so it would be useless. Thanks :)
This looks very handy indeed ! (the video was of great help to understand why it could be useful) I'll very certainly try it later, when I'll have the time & motivation :) Thank you for suggesting it to me !
I still use Winamp too XD (since... 1998 ?) It's so light and do only what I need. And ffdshow is included in Satsuki if I'm not wrong. Btw, I just uninstalled Windows Media Player ;)
Okay, I'll try it :)
Indexing disabled ! (I remembered something like this but couldn't put the finger on it). For telemetry I'll take a look later too :) (it seems a bit long) Thanks for the links :)
Config panel -> Power Management (or Power options, not sure of the english translation).
Well.. it's because each time I got a laptop or preinstalled windows, there was already several "power management" preconfigured settings : "High performance" "Energy saving" "Normal"..... Here I've got only 2 options : "normal" and "power saving". So I was only wondering, so it's ok, it seems fine ;)
Indeed, it was 5400RPM, a WD "Caviar Green" so it seems logical :)
I'll keep an eye on this automatic defrag ;)
Total Commander will certainly help. But "Don't type when loading other programs" is sometimes simply losing time for nothing (for me) : for example when I launch LibreOffice, it can take a while, and I can't see myself waiting here doing nothing XD And when you launch a big copy in windows which may take several hours, sometimes a question suddenly appears like "Are you really sure you want to replace this file ?" So I prefer to be on my comp', but only clicking is very limiting :P
Nah, I'm not launching several big things at same time, it's not a good idea I know that very well [from experience] XD
Thanks :)

By the way, I have an issue with Windows Games Explorer, but I don't want to annoy you more, so I'll certainly create another thread. I already described a bit my issue with Sudden Strike 1 & 2. If you're curious about it and/or would like to try to help : have you already heard of this issue ? And of a potential fix/windows update to do ?
You already helped me a lot, so don't feel forced to help more if you don't have motivation or time :)

I'm not sure if it was a good idea. Depends on what the uninstalling actually does - if it just cleanly removes the WMP or messes up with the codecs too. I've never bothered with it, just disabled most of its options to go online, search for codecs, lyrics, etc.
I usually avoid uninstalling Microsoft programs that come with windows by default (like Internet Explorer, WMP) because they are so much interconnected with other things in Windows.

How big are those? Or are you talking about those from the bad drive? When I have many GBs to copy, I try to do it in smaller portions at a time. Don't know, watch something on youtube while doing that. :P


Regarding Windows Games Explorer/GameUX, I'm not too familiar with it - never used or had problems with it.
I know GOG games come with GameuxInstallHelper.dll (it registers the game in GameUX, I think, or something like that), so you might wanna try delete (make backup fist) that before launching a game.

Huh, don't remember seeing that, but maybe because I disable most of the things in its options. Or maybe it's in newer versions if you installed any updates for it.

It's in the installer and the game's folder. Back it up and delete it from the game folder, see how it goes.