Can't fix my brightness level

[Azerthas]

When I try to change the brightness level, it just shows the new brightness for a few seconds and then goes back to default (I think) which is way to dark so I can't see anything!

I'd like to be able to play this game again!
Help would be appreciated! 

[1337-Kynes]

What operating system are you using? Have you tried fiddling with the variable directly (r_gamma)?

[{FoT|PeDrO}]

Download tremfusion http://archive.mercenariesguild.net/Client_Binaries/TremFusion/