My computer locks up, but the mouse doesn't...?

[The Last Bard]

Okay, here's my problem, after about...Well, anywhere from an hour to five hours my computer will lock up and I'll have to turn it off and on.
I can still use the mouse, and sometimes after I wait a while it will start working again, but I usually can't use something, (MSN Messenger. I think I haven't been able to use Windows Media Player a few times.)

It usually happens when I'm listening to music and chatting or browsing. The music will continue to play, but I'm not able to click anything. I can still use the mouse, but not click anything.

Right now I'm listening to a song in WMP and typing this and my CPU usage is 18% is that okay?
MSN Messenger is running in my system tray, and nothing is happening with that. And I currently have 53 "Processes" working or whatever.

I can take any help! Thanks!

[Slater]

try Adaware; it scans for malicious processes...

[Destroyer2000]

Yeah, it sounds like a virus or spyware. If your computer is running at near 100% at any point, there is usually a problem, so if that happens sometime in the future...you know what to look out for. It could be, thuogh, that your sound card can't handle the music.

[The Last Bard]

Okay, I made a new user account, and now it's working fine. Thanks anyway!

[Mithrandir]

That makes it sound even MORE like spyware/malware. I'd strongly recommend using adaware or another such package to ensure you do not have malware installed on the computer. You'll want to run it under the affected account, though.