Wow, thanks to everyone for their many & varied responses.
I re-ran Norton Anti-virus 2004 (with latest virus definitions) again and everything comes up clean. I assume that NAV 2004 (with latest virus definitions)would spot that notorious blaster worm virus right? I think I even recall running a special blaster worm scan (from Microsoft or NAV) on my computer some time back and it came up negative then as well.
cassp: I downloaded & ran Ad-aware (per your advice) and have forwarded the log file to Mike (msutliff) per his request. The log contained a number of suspicious files so I'm hoping one of these may be the culprit of the problems I've been experiencing. I'm waiting till I hear back from Mike before actually removing though.
Frank: Good advice about removing virus protection before installing new programs, but don't the latest versions of Norton AntiVirus (such as NAV 2004) now allow you to safely install programs without having to disable NAV?
Glenn: How did you discover the Blaster Worm variant, and how did you remove it? Did your virus checker (NAV?) find it in a routine scan?
Terry: I checked the uninstall files in the Windows Directory you directed me to and there are like over 50 files of this type.
I rather fear messing with this files .
DonM: I guess System Restore is an option, but this might mean going back rather far as I've been experiencing this erratic problem for over a month, and a lot of stuff has been added to my PC since then.
The above reported problem I'm experiencing is rather erratic. Sometimes I can go a whole day without it occuring, while other days, it will happen several times a day or even an hour.
I'll let you guys know if deleting Ad-aware suspicious files solves the problem or not. I'm waiting for Msutliff (Mike) to get back to me before actually deleting them.
Scott