License problem

Howdy. The wife's computer has been having alot pf problems lately so I
backed up her data, Fdisked and formatted her hard drive, and then
reinstalled her XP Pro. I then pulled her data back over and did the whole
SP2 and A/V thing. The computer is working OK now but when she tries to
listen to her songs that I saved, some of them will not play. They turn
orange with and ! and if you place the cursor over them you see a message
that starts "A license cannot be found for this media file." So yep, I did
not back up her license stuff. Is there any way around this? A couple of
these albums I cannot find any more and of course my wife is a little upset
with me. Any help would be greatly appreciated. Thanks.

Aaron