[petitchou]

hi everyone. i received such excellent help on my previous problems here that i thought i would come here for me new, evil problem.

so here is the story.
about one month ago i downloaded a program that is supposed to remove malware and worms..anyway, when i opened it after installing it my computer screen went black and rebooted. windows did not load. i ended up having to format it and since then it was behaving strangely. i formatted a few times with the same problems occurring (my firefox was crashing a lot, so was my msn, the computer would also reboot at random times, most often when i would come back to it after leaving it for awhile) so i eventually decided it was hardware, not software. i did a memory test and it said that was fine.
so today i decided that i would take everything out, clean/dust it and put it back in. this is when the current problem began. my computer will boot up and windows will begin to load, but it either loads forever (that little blue thing keeps going across the screen) or it reboots as soon as windows begins to load.
i am pretty sure this is a hardware problem. i have two hard drives and it behaves the same way for both. i do not know enough about hardware to know what could be causing this problem.
please help!
thank you, in advance.

computer specs:
Windows XP5.1 (Build 2600) Service Pack 2
704 MB DDR
AMD Athlon(tm) XP 2200+, 1.82 GHz
ATI Radeon X1050 Series video card