[usslindstrom]

Sounds to me like somthin' funny's goin' on with the system then....

Could try some of the following, seems like a few people are having somewhat same experiences as ya':
http://www.computerhope.com/issues/ch000726.htm
http://www.bleepingcomputer.com/foru...c52047-15.html

BUT My guess is some kinda' malware/virus/etc...

Please download the following and run em':

http://www.download.com/Spybot-Searc...ml?tag=lst-0-1
http://www.download.com/Ad-Aware-SE-...ml?tag=lst-0-1
and an antivirus solution:
http://www.download.com/AVG-Anti-Vir...ml?tag=lst-0-1 *Although you said you have Macafee, so you can prob. skip this step

They're all worth a shot - to atleast see what's going on with your PC.