Random Computer crashing post Wireless installation

Ok, I'm not quite sure what the source of the problem is. My father decided to buy the D-Link DI-524 Wireless modem today and it came with a USB wireless device which I use on my computer. It was working fine all afternoon but tonight I've suddenly been experiencing random computer freezing. Windows XP PRO SP2 becomes completely unresponsive and I am forced to do a hard reset. At the time I had also disable the integrated sound on my motherboard via BIOS.

The freezing seems to occur at random. I disabled uTorrent from loading with Windows as I thought that was initially the problem. Windows has frozen on me with no programs being opened other than the default start up ones, with Word open, with Firefox open and with a combination of the above programs open.

I tried re-enabling the motherboard sound, but it had no effect on the freezing. I also tried to uninstall and then install the drivers for the wireless device again. I still experienced freezing after that. The freezing occurs at random times. A few times the computer has frozen almost immediately upon being rebooted, and another time it took about an hour before it froze.

Any ideas as to what else I could try to solve this mysterious problem? My family would really like to get rid of that ugly ethernet cable going around the house.

Thanks.

EDIT:

Just thought I'd mention that I'm currently running spyware removal and a virus scan. The virus scan seems to have picked up a few viruses, so I'm going to remove them and see what happens. Still though, I'd appreciate some advice from the more tech savy.

Additional Spam:
Removing the virus did nothing. The computer just froze on me again. Fuck, this is annoying.

Jam it back in, in the dark.

Nobody has any ideas?

There's nowhere I can't reach.

I have no idea what you just wrote.

This thing is sticky, and I don't like it. I don't appreciate it.