Error - unable to sync

I tried updating today and got stuck on this message:
Restoring iPod from backup...
Time remaining: about 5 seconds
Went out for about 5 hours, came back, and it's still the same. I gave up and went into the processes and ended the program. Restarted and my iTouch looks like it updated successfully but there's no music or videos at all. All my Apps are working though.
When I try to sync, an error message pops up saying:
"iTunes was unable to load dataclass information from Sync Services. Reconnect or try again later."
I've both reconnected...and tried again after a few minutes. Still get the same message :/
Anyone having this problem? Any idea how to fix it?

lucky you! I've tried everything and to no avail. My Itouch is still dead. With that beautiful itunes/usb logo stuck on its screen. I tried last night connecting it to another computer, which recognized my Itouch, proceeded to restore it, then it installed the new software and there it was again the same logo on my itouch screen. Today I uninstalled everything and after installing Itunes with all its components again connected my ipod and the same window appears.
'Found new hardware'
'Windows needs to install driver software for your apple mobile device (recovery mode)'
It gives me options on what to do, 'locate and install driver software' 'ask me again later' & 'dont show this message again for this device'. I choose the first one to install the driver software, it searches, but then comes back with another window saying...
'Insert the disc that came with your apple mobile device (recovery mode)' but i dont have that, so i click for other options, and it browses the web and never finds anything. This is so frustrating, my ipod will not connect to itunes so i cant restore it, i dont even know if i'm on ios 4 because i can't even get on it.

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