Explorer.exe takes 100% of CPU someites? Possible fix?

[Distraction]

Alright, here's the stats for this computer:

Windows XP home Edition with Service Pack 2
AMD Sempron 3100+
512 RAM
...And the rest doesn't matter.

For some reason, explorer.exe (nothing to do with Internet Explorer or Windows Explorer) sometimes shoots up and uses 100% of the CPU. Which makes the computer useless unless you shut explorer.exe down in the Task manager and restart it.

To be honest, I haven't been able to see a pattern. It's almost completely random, from what I've seen. I've got Service Pack 2 and all patches from Windows Update, plus any I could easily find for the motherboard.

So, any help? Thanks.

 

[Proximon]

Sounds like a virus to me.

Here is a link
http://www.liutilities.com/products/wintaskspro/processlibrary/explorer/

 

[Distraction]

Alright, I'll try that. Not sure if that's the problem, though. I scan with AVG a lot, but I'll give that a try.