I know this is a dead thread, but at the risk of being late to the party, HTC sync sucks with Win7.
My best solution? My Phone Explorer from the play store. It's free and works like a charm with any phone (or at least the HTC and Samsung one's I've tried) and Win7. Sync to Outlook, Thunderbird, or pretty much any other windows based calendar/contacts software.
Anyway - two years later - I hope this helps!