Suspected Malware, XP

Hi,

I read the stickys, but apologies if I've missed anything.

I'm running XP only with F-secure, I know it's not great but it's my office PC and F-secure is the only licence we have. So I started having problems yesterday, hard to describe specifically, general slow behaviour, google searches are re-directed that type of thing, but nothing's awry at first glance. About 2 mins after start-up F-secure reports a malfunction in the taskbar but appears normal when opened.

OK, so I ran superantispyware and found 28 adware things and 2 trojans. Removal of which made no difference. Then I found you're site and followed the read me first guide, however I was unable to d/l combofix from their website. Apart from that I followed all the advice and I've attached the logs from superantispyware, malwarebytes and MGtools.

BUT during running MGtools I got a blue screen message. I restarted and finished MGtools compilation, but now I get the blue screen every time the PC is left idle for a bit. (F-secure didn't like MGtools, so I had to disable it during). Blue screen message is along the lines:

"A problem has been detected and you comp has been shut down to prevent damage........

...Technical information:

***STOP: 0x0000007F (0x000000008,0x80042000, etc etc (but just one line))

Beginning physical dump...."

I open to the idea that this is some hard/software prob, but this all happened after some peculier behaviour from F-secure mentioning trojans wich it was unable to disinfect.

Anyway I very much appreciate any assistance you might have, and apologies for long post.