What manner of coruption are we talking about? Is it virus related? If it is you might want to consider torching both partitions. Of course part of that depends on what FS you are using on each partiton. Its not hard to guess that the 98 is FAT32 but what is the XP under. Im just concerened that the xp partiton may have become corupted in the process. I gotta go with sword_fish on the back up before you start. Maybe a little better explanation would help us help you