Hi

After my comp has been on for few hours, it goes a little crazy, like say im listening to music via winamp, everytime i close a borwser window, my comp just freezes for about 3 seconds so the song does as well and it is very annoying as i could understand if my computer had been on for days, but only has to be on for a few hours.

I've ran a virus check, no viruses.

My system resources are at 60 per cent normally.

It's been happening since i defragged my drive for the first time in a while last weekend, any ideas pls as i have to keep re-booting.

Thanks