Edited out superfluous info.
Just checked on my Vista machine, path should be --> C:\Users\"username"\AppData\Local
Apparently ( according to random google search ) the XP path is --> C:\Documents and Settings\(User)\Application Data.
As for restoring the information, I do not claim to know anything about it, but it seems that this site may help:
How to manage personal folders files in Outlook (IMO)
If it does not, there will be something on Microsoft's site there that will explain the procedure