Unable to backup iPad/Update to 4.3

My iPad will not update to iOS 4.3. I am getting an error message that says "ITunes could not back up the iPad '*' because an error occurred." The additional information is not particularly helpful.
I am running iTunes 10.2.1.
Actually this error message has been happening for a couple of weeks now and I actually had to restore it last week because all of my apps were crashing but lately (since the restore) the iPad seems to be working well otherwise and syncing fine as well. It just won't complete the update now.
I would appreciate any ideas, thanks very much.

Hi,
Help here for alert messages.
http://support.apple.com/kb/TS1275
Click your Apple menu (top left in your screen) then click Software Update just in case you need to update your Mac OS X.
Carolyn

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