Help! Just updated my Ipad2 to IOS5 and have now lost 90% of my music!

I updated my Ipad2 to IOS5 by linking up to my itunes on my Windows pc. It appears that all music I'd uploaded to itunes from CD's over the years has gone, all purchased items are still there though.
I've lost about 10,000 tracks - is there any way I can retrieve these? I've tried to restore from a previous backup but all the files have disappeared from previous itunes libraries too!
HELP!

The tracks are showing in iTunes on my pc but won't play - it says it can't locate the file. When I check in my system iTunes folder, none of the cd import files are there.
Have tried syncing to iPad again but only purchased tracks will sync. I get an error message which says 100+ songs could not sync as file cannot be found?
Any ideas? I'm stumped!

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