A few days ago, my computer started going nuts about 15-20 minutes after I turned it on. The fan would kick on, my fps would drop to 1 or less, hitting File->Save would take 2 minutes of "not responding" to take effect, even just closing an application takes 90 seconds or more.
I've gone through the baby steps of trying to diagnose the problem. I've run my McAfee scanner, but it's out of date. I downloaded the free version of Avast!, and it hasn't found anything wrong either. I went into my task manager and looked at the processes running.
Task Manager
Despite not running anything but Task Manager and there being only 3 processes requiring CPU time, my CPU is running at a constant 100%. I've googled the list of processes and they all seem to be necessary or benign.
If I restart my computer, the problem goes away for another 15-20 minutes, and then it's the same thing all over again.
I've had to bail on a dozen groups now, it's driving me crazy.