It's most likely due to the engines reporting GL extensions getting a string way too long. Many source ports fix this

You should also delete opengl32.dll in your quake/hexen2 folder

For engines try these:
http://icculus.org/twilight/darkplaces
http://directq.codeplex.com/
http://uhexen2.sourceforge.net

for hexenII I use raven's NewHexen engine, it is under "essential files" on their official site...

keropi wrote:

for hexenII I use raven's NewHexen engine, it is under "essential files" on their official site...

That's not from Raven

that's an outdated closed source engine that doesn't even fix bugs

There is no official third-party source port

leileilol wrote:

That's not from Raven […]
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keropi wrote:

for hexenII I use raven's NewHexen engine, it is under "essential files" on their official site...

That's not from Raven

that's an outdated closed source engine that doesn't even fix bugs

There is no official third-party source port

yes I run this outdated port on my outdated pentium3 with an outdated voodoo5. 😵
I realise now OP uses win7 so yeah, nhexen probably is not good for him..

as a sidenote, darkplaces crawls from time to time on a tualatin 1.4ghz pIII + voodoo5

thx all