On my dad's computer, I went into the eBay.com web site. At the top of the page, it said "Welcome," and then some garbage characters where the user name should have been. I clicked "services" button to try to see if anyone else had logged in- but it just asked for a user name and password, indicating that no one was logged in. Any idea what happened? Should I be worried? The computer runs Windows XP (all updates), Firefox (all updates), and Trend Micro Internet Security (all updates).