Default profile in Win XP Pro Corrupted

Hello all,
I had upgraded my system recently and loaded Win XP Pro. For a couple of days it has worked fine, but now suddenly it shows that the default profile has got corrupted as a result, I can not shut down my machine. I have to use the hibernate option so that all the instances open during shut down are saved. I am currently using a temp profile. One option is that I run the XP installable CD and use the repair option. But if I do not want to use that what would be the other alternative. Please advice. Thanks in advance. Kamal