Before formatting I use to play Age of Empires II, Gallatic Battlegorunds, Theme hospital (the old ones) and games of this species. However after formatting when I start the game being the PC restarts, before I see the first screen of the game. But when I go to play Natural-Selection (Half-Life MOD) everything works perfectly. I would like to know if someone knows something about it.

PC:
AMD Athlon 2100+
256Mb DDR
MB A7V266-C
NVidia GeForce4 You 4200

All drivers are up to date.
Thanks

which operating system do you have

Uhh, true true

XP