I have found the problem...
It was a tiny greasy spot on the Windows CD... :S
And yes, it took me all night to find it...
So now it works!
ABIT NF7-S rev 2.0
AMD XP1700+ JIUHB @ 2195 (190 x 11,5 @ 1.85V)
NANYA PC2700 333 @ 380 (@ 2.6V)
ASUS V7700 GeForce 2 GTS
350W Noname PSU
Thermaltake Dragon Orb 3
3 12V 80mm Casefans