My dad's pulled the power cord out the back last night and as the battery is long since dead, it shut down. Trouble is it won't restart - it gets as far as the xp logo then restarts, says it had a problem and how would I like to boot (safe mode, normal etc). All options start this loop again.

I have the xp disc but thats all. I don't want to reinstall cos he'll lose little programs, bookmarks etc. Not a huge deal but just annoying.

Any ideas if its a simple fix? I can access the repair console from the disc. I was also wondering if its possible to reinstall xp over an existing one and just install missing or damaged files?