Bought Lenovo W500 ThinkPad new in 2009 withXP downgrade. Reformatted twice without a hitch. I even kept a journal which told me that I got in with F11. This time F11 won't repond. In desperation I tried using the set of 10 disks that came with it. Never used them before. They do load Vista but when I try to click in I get an error page. I think I may have wiped XP off the HD and don't have a copy. Do any of you know how I can verify this? Thanks for any help.