Well here is the problem:
Every time i set ANY aplication on Full-Screen mode (Games, Avis, Mpegs, anything that can be set on full-screen) after a few minutes when I close it, I get this error Message:

EXPLORER caused a stack fault in module
KERNEL32.DLL at 0167:bff8435e

Registers:
EAX=007D22B8 (OTHER VALUES GOES HERE)
EBX=00415200
ECX=007D20B8
EDX=00000002

and then all DESKTOP items dissappear, and i mean all of them, Desktop goes blank then the same message appears one more time but this time the REGISTERS are different:

EXPLORER caused a stack fault in module
KERNEL32.DLL at 0167:bff8435e

Registers:
EAX=00c52488 (OTHER VALUES GOES HERE)
EBX=00415200
ECX=00c52288
EDX=00000005

and i have to reboot every time this message appears (It always appears twice).

I've been lookin for some time now, and i haven't seen this particular problem on the WEB... Please anyone has a FIX or something?