old games don't start, help needed...

[Death BOO Z]

I've got this problem for a couple of months already, I install a game, and when i try to play it, it freezes right after the openning movie and gets stuck on the main manu when it moves really slow and i can't do anything...
I tried several games (WC3, DS1,AOE3 and a few more) and only two games worked (SC and HoM&M 4), the problem happened with both legit games and non-legit games, even some games that used to work on my other computers.
I also tried updating drivers and stuff.

computer: 2.4GHZ, GEforce 400MX.

edit: see later post 13.6.2008
edit2: see later post, 16.7.2008