I recently got a look at Windows Vista machine that had the smitfraud virus. The smitfraud virus puts a throbber that shouts various security warnings in the bottom toolbar. There was no way to fix this except reinstall the OS! Since no Vista restore CD was shipped we decided to scrap the machine (save the HD) and get an iMac. Lesson learned: Viruses and spyware abound and many Vista machines ship without restore media!