Hello,
Backup Exec version 9.1 can very well run under Windows XP Pro. You can check that in the software compatibility list too which you can find at the following link:
VERITAS Backup Exec (tm) 9.1 for Windows Servers - Software Compatibility List (SCL)
http://support.veritas.com/docs/261695
You can try running the restore after cataloging the tapes. In case you need to redirect the restore, to add to Ken's mail, you can check the technote given below:
Title: How to perform a redirected restore in Backup Exec for Windows Servers
http://support.veritas.com/docs/196460
Hope this answere your query. In case you still have any more queries on ths post, do write back to the forum. However if we do not receive your update within two business days, this post would be marked assumed answered and would be moved to answered questions pool.
Regards.