My computer crashed during a recent storm. It won't boot saying a file is missing. We have tried doing a recovery, copying files, etc. We attempted to reinstall XP but got a message saying there was already an operating system on that drive making it sound like it was going to install a second copy instead of overwrite the damaged one. What will happen if we reinstall XP without reformatting the hard drive? There is a large amount of family pictures on that drive that have not been saved to another location yet and we don't want to lose them.