Shoutbox

Im going to assume that you use the welcome screen.. Instead of clicking on your username, hit ctrl+alt+delete (sometimes has to be twice) and it will take you to the old school login promt. Type 'Administrator' as the username, and enter the password used when windows was installed, which could just be blank.. Once you get logged in on there, try doing a system restore. That should work assuming that only your user account settings were deleted..