CPU jumping to 100% Usage

[apakhe]

Hello there!
Recently I got this issue that I can't figure out how to fix it. Sometimes, my CPU goes up to 100% usage(out of nowhere) and then a strange beeping sound comes out of my PC. Why is that?
That thing pops up when I am playing WoW or when I am simply surfing the web... And I don't think that WoW or Firefox can use that much CPU juice.

My system specs are:
Intel Pentium 4 631 HT 3.00Ghz
2 Gb RAM
Nvidia GT220 1 Gb Video Card
160 Seagate ATA HDD

Can you help me with it? Thank you!

[aelod]

Can u check the cpu cooler and the temp?

[apakhe]

I recently cleaned my PC of dust and also replaced the CPU thermal paste...

[Valtam]

Playing WoW through Wine on that specced hardware is the reason. Open Task Manager whilst all those programs are running and sort by cpu use. Also look at the difference in temps when running Wine and WoW and when not running it through the nVidia Settings.