Actually LR, I can tell you why
End of summer/early fall a new type of botnet program was released to the wild that spoofed Paypal and Ebay (amongst many others), meaning you would be presented with the bad guy's version of the addy (which was absolutely malicious) but not the real one. You may want to use Spybot Search and Destroy (freeware found on download.com) and/or Ad-Aware by Lavasoft (also freeware found on download.com). Both of these programs are known good and the company I work for packaged them on their free trial CD's after partnering with them for distribution. The botnet has not yet gone away unfortunately, but if you keep your machine clean you shouldn't have to worry about it coming back to haunt you (or any other nastys). Good luck and GREAT subgroup!!!