Svchost.exe netsvcs Memory Usage.

Hi. Just recently my Dell Inspiron 1520 has started going really slow. I've looked some things up and it seems that my svchost.exe attached to the group name "netsvcs" is using approx 80-90% of my CPU at any given time..... I've got no idea why this is happening, even when I have no programs running it's still using a HUGE amount of CPU.... Any ideas on how I can fix this? I play World of Warcraft and this kind of lag makes doing that, and other things, nearly impossible. Thanks.