My mom has a pc that is not starting up. It has windows vista and is freezing at the loading bar. I went into safe mode but the mouse wasn't working. Shut it down from there and it said shutting down so it wasn't frozen, it took a long time to load at (i think) CRCdrive.sys. I would like to run startup repair on it but i can't find it on vista. Should I try Last Known Good Configuration? Thanks.