Help! How to kill reserved space from other computers

Ok, I don't know how I mangled my last post so bad, I deleted it to start over.

So I checked my Trophy and there are about 5GB of "Reserved Space" used. I checked the Zune software to see which PC's I have sync'd the phone with and as of last checking, it doesn't list ANY PC's. Any other way to find out which PC's it has sync'd with so I can try and reclaimed some of that Reserved Space???
 

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