My computer used to be a Ubuntu/Windows XP SP3 dual boot. I left it on while I went to see fireworks on July 4th, and when I got back GRUB gave me a "no such device, grub rescue" prompt. I then used PowerSuite 2009 to recover the default Master Boot Record. Now, whenever I try to get into Windows XP, it freezes at the startup splash screen, with the blue bars frozen. The only way to restart is to do a hard reset. After that, Windows will complain that it didn't shut down correctly. Safe Mode freezes when it tries to load AVG's .sys files. Last Known Good Configuration gives the same results. I've tried reinstalling the MBR with PowerSuite 2009 to no avail. I do not have the XP installation disk handy, either.