Guys, this thread is 5 years old, charlemagne1980 necroed it just to s**t on Gog

....Fuck :-D

Well...

https://www.youtube.com/watch?v=1uobO9VNi14

That's terrible advice and untrue. Stop shilling for that pile of Steam on GoG.

If you literally tried all of your games and 90% of them literally do not work, this is unusual and I would be inclined to think it is something specific about your computer setup that is breaking a lot of games as that's definitely not been my experience on Windows 7 or 10. I have the opposite experience usually where games that don't claim to support Windows 10 actually work anyway, or can be made to work with a few tweaks found online.

My initial suspicion is possibly a corrupted video driver installation. Usual recommendations to rule that out are to download the driver removal tool from your video hardware vendor, uninstall the driver and run the complete removal tool or whatever the instructions for it suggest, then download the latest driver and install it properly and reboot and see if that makes any difference.

If it isn't a corrupted driver installation, then my other inclination is if there is any possibility that you have configured your graphics control panel settings to override any graphics settings on your computer globally, l ike overriding antialiasing or other 3D settings for all games. Some of these global override settings definitely can prevent some older games from working at all, or can corrupt their graphics. I know one such setting for sure - Morphological Filtering, will corrupt the graphics of a lot of older 1990s/2000s games making the game look extremely blurry and unplayable for example, so if this is applied globally in Windows in the Nvidia or AMD driver panel for example it could make a lot of older games unplayable. If this problem occurs, the solution is to avoid using global system-wide 3D setting overrides and instead use per-game overrides.

It's also possible that the default global settings from AMD/Nvidia could even interfere with older games and you might have to experiment to find a solution or look in help/support articles, the forums or on places like PCGamingWiki for tips on getting older games running in newer Windows, and various caveats and workarounds that might be needed.

Of course your problem could be something else entirely, but these are a couple of things that are worth investigating in case they could help. I've definitely encountered old game compatibility issues with the above before and was able to resolve it. GOG support actually informed me of the issue with regards to morphological filtering for example (it broke Robin Hood Sherwood Forest, Nations, and Alien Nations to name a few).

Anyhow, hope this is useful for you (or anyone else). Best of luck!

I wasn't accurate enough. I meant the really old games,15-20 years old or even older ones. Though with the help and suggestions of the kind people of the forum I was able to make most of them work.

One of GOG's biggest perks is having their older games run on newer PCs out of the box.

you'd have to be pretty foolish to wait 30 days to test a game you bought.
Goig back to my W98 and XP PCs it is just such an incredibly superior and stable experiene than using anything from GoG from that era; even later titles like Dark Forces II and Rainbow Six are utterly broken on GoG.

Or wait 22 months to respond to someone's post. :)

Only the ignorant suppress knowledge

Well, I never gained any from this thread, so fail to see your point...

i have Dark Forces II and Daark Force 1 both working fine on my 2 Windows 10 laptops

specs ; https://valid.x86.fr/fsmjd1 and https://valid.x86.fr/uh81mr

i expect the real issue you have is hardware not Gog but good luck

How do they do that? Do they manipulate the code?