Hi there. I was using Windows 7 Professional for a few weeks (thanks MSDN Academic Alliance) and I have a huge problem since last week: I cannot boot on Windows 7 anymore after a registry defragmentation. Explanation: I used Glary Utilities Registry Defragmentation to defragment my registry and it said it can defragment my registry up to 66%! Which was a huge value, so I said "ok, do it dude!", then it reboot the computer and performed the defragmentation (I guess, I wasn't in front of the computer...) then reboot again. And from then, my computer doesn't want to boot anymore! I arrive to a screen with only two options: * Start windows normally * Launch Startup repair (recommended) If I start Windows normally, it automatically reboot again, and again... If I start the Startup repair, it does not detect any Windows 7 installation!!! Fortunately, I have a linux partition on the hard disk and can access to the data. Everything is still there, my documents, my "Program Files", but I cannot boot anymore. I tried the Installation Disc in Rescue mode, it doesn't detect the win7 installation neither. Is there a way to restore the registry? Or any other way to fix the problem? PS: Asus F3U laptop. possible problematic softwares: Kaspersky Internet Security 2010 (active), Avira Anti-vir (inactive but still present).