No names and too dark

[Imago-Thunderfist]

Heya, today I finaly managed to get my new computer running and installed Regnum. But... in maximum settings the game is way too dark, even by raising gamma I still can't see any-one in the shadows. And if I press V or select some-one, I can't see their names.

http://imageshack.us/photo/my-images/9/settingsia.jpg/

Can some-one please tell me how to fix this?

Thanks in advance,

P.S.
I have a HD7870 videocard or whatever it may be, a Z77 Extreme4 motherboard, and some other stuff I don't remember the names of

P.P.S.
Found my computer's components:

ASUS HD7870-DC2TG-2GD5-V2
Intel® Core™ i5-2500K
Club 3D CSP-S600
Zalman Z9 Plus
ADATA AS510S3-60GM-C
LG CH10LS28
ASRock Z77 Extreme4
Seagate ST2000DM001
Corsair 8 GB DDR3-1600 Kit