McAfee Consumer Products Removal tool (MCPR.exe)
http://service.mcafee.com/FAQDocument.aspx?id=TS100507

Run it to clean up the mess left behind.

If it has a video card, does it have a fan?

Have you removed the front bezel and cleaned behind it?

This 4600 maybe close to yours.
http://www.ehow.com/how_5105725_remo...dimension.html
I have found plugged up filters behind the Bezel.

Those missing sensors where common on the older computers.