Using WinXP, SP2, Malwarebytes free brief scan found a worm from RegTidy, worm.autorun.B. Also identified as a Rogue in 4 places in Docs & Settings. Note that I had downloaded this program and was suspicious and uninstalled it.
Not found by AVG free, hijack this, cw shredder, & spybot s&d. FYI, no firewall other than a hardware router.
This is the first bug I've had in years and prior had used Eset NOD32; guess you get what you pay for! Perhaps I'll try Avira free prior to returning to NOD32 which I believe still has a sound reputation.
As much as I enjoy Download of the Day at this stage am questioning it's use -- checked the website and found several others had also reported this bug.