Even with a clean install, no mods, the game doesn't work for me, at all, whether I use Direct3D or software rendering.

No error message shows up from the game, and even Windows doesn't give me a generic "deus ex has stopped working" message. The screen just goes black for a second, then the desktop shows up again.


Event viewer in Windows shows:
Exception code: 0xc0000005
Fault offset: 0x037377ab
Faulting process id: 0x66ec

Unfortunately I'm not sure exactly where the crash log would be for the GOG version. I did search this forum for "crash log" but that search returns every "deus ex crash" entry without the word "log"

I found the instructions for the Steam version's crash log, but that didn't help me because I'm using the GOG version.

I did search just the Windows Event Viewer error codes, but the "access violation" meaning behind the error code, I tried running as admin but it didn't work, or even change which error I got. Since it sounded like a security thing to me, I looked in my Bitdefender notifications to see if it threw a false positive (I've had that happen with old software before, that I knew had to be a false positive, because I got the software from the real company's website or from GOG directly)

I'm still running Windows 10, not Windows 11, or I would have chalked it up as Windows 11 backwards compatibility only "going back so far" - the very reason I'm holding out on upgrading my desktop. (The motherboard isn't Windows 11 friendly anyway, so I *can't* upgrade just Windows by itself)

I currently experiencing the same problem, I want a mod free experience but even launching the game without mods just crash over and over again.

The system specifications would help.
Have you had any luck running t as admin and or with compat settings?
Run dxdiag and check the results for something amiss.

If this is about the original Deus Ex , i completed it without a crash recently with only using Chris Dohnal opengl render (no other mods) :
https://www.cwdohnal.com/utglr/

the version 2.1 of his render to be precise :
https://www.cwdohnal.com/utglr/dxglr21.zip

To install, just drop the OpenGLDrv.dll that is inside the zip archive, into :
C:\GOG Games\Deus Ex GOTY\System\
replacing the old opengl file that is there

Then in your DeusEx.ini ( located in C:\GOG Games\Deus Ex GOTY\System\ too)
at the section
[Engine.Engine]

change whatever is at GameRenderDevice=....
by
GameRenderDevice=OpenGLDrv.OpenGLRenderDevice

then in the [OpenGLDrv.OpenGLRenderDevice] section
replace the whole section by those, as it's the settings i used and didnt crashed

[OpenGLDrv.OpenGLRenderDevice]
Translucency=True
VolumetricLighting=True
ShinySurfaces=True
Coronas=True
HighDetailActors=True
DetailTextures=True
UseTNT=True
MinDepthBits=16
MaxLogUOverV=8
MaxLogVOverU=8
UseMultiTexture=True
UsePalette=True
UseAlphaPalette=False
ShareLists=False
AlwaysMipmap=False
DoPrecache=0
UseTrilinear=False
MaxAnisotropy=0
SupportsLazyTextures=0
DescFlags=0
Description=
ZRangeHack=False
AAFilterHint=0
NoAATiles=True
NumAASamples=4
UseAA=False
RequestHighResolutionZ=True
MaskedTextureHack=True
SmoothMaskedTextures=False
SceneNodeHack=True
FrameRateLimit=0
SwapInterval=-1
UseFragmentProgram=False
UseVertexProgram=False
UseCVA=False
UseMultiDrawArrays=False
TexDXT1ToDXT3=False
DynamicTexIdRecycleLevel=100
CacheStaticMaps=False
UseTexPool=True
UseTexIdPool=True
UseSSE2=True
UseSSE=True
BufferTileQuads=False
BufferClippedActorTris=True
SinglePassDetail=False
SinglePassFog=True
ColorizeDetailTextures=False
DetailClipping=False
UseDetailAlpha=True
DetailMax=0
RefreshRate=0
MaxTMUnits=0
NoFiltering=False
NoMaskedS3TC=False
Use16BitTextures=False
UseS3TC=False
AutoGenerateMipmaps=False
UsePrecache=False
UseBGRATextures=True
UseZTrick=False
MaxLogTextureSize=8
MinLogTextureSize=0
OneXBlending=True
GammaCorrectScreenshots=False
GammaOffsetBlue=0.000000
GammaOffsetGreen=0.000000
GammaOffsetRed=0.000000
GammaOffset=0.000000
LODBias=0.000000

https://support.gog.com/hc/en-us/articles/213039325-Crash-when-an-FMV-intro-or-cutscene-should-be-played?product=gog
Disable full screen optimizations worked for me.

Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz

16GB Ram

Radeon RX 580 (Sapphire card, if that matters)

Good idea. Unfortunately, that didn't work. I searched for Chris Dohnal opengl render on Google, and found a Reddit post discussing some other patches and "improvements":
[url=]https://www.reddit.com/r/Deusex/comments/4nsw73/going_to_play_the_original_deus_ex_for_the_first/[/url]
However, it still doesn't work, and the error code in event viewer is still the same, unfortunately.

It's especially confusing since it's the same hardware on which it used to work perfectly fine.

Other option is to use the community update, that maybe will work.

Try to uninstall completely, then :

- delete the \Deus Ex GOTY\ folder left behind (that is in C:\GOG Games\ by default)
- delete the \DeusEx\ folder that is still located at C:\Users\YourUserName\Documents\

that should allow to re-install clean , this way we're sure there's no bad Deus Ex setting left behind

note : make sure you install in the default path (should be C:\GOG Games\Deus Ex GOTY\ ) , don't install in some C:\program files\ or something like that, as with window 10/11 security system there may be some issue in getting the game running correctly (as it can happen for some games)

Once the game is reinstalled cleanly like that, see if it run

I still recommend the Chris Dohnal OpenGL render, one of the most solid Deus Ex render in my opinion.

edit : noticed someone else had a error 0xC0000005 too :
https://old.reddit.com/r/Deusex/comments/12nh2t3/unable_to_run_deus_ex_goty_at_all_on_windows_11/
apparently in his case it was the sound/audio that was the source of his crash