Ipod Nano stuck in restore cycle

I have 2 Ipod Nanos (Gen 2 and Gen 4) that were working fine until the Itunes 11 updates. Now when I connect them to the up to Itunes it states that they need to be restored. I try to restore but it just cycles back into restore mode and just stays in the loop. I can take them to a Itunes version that I have not updated (version 10.4) and they restore fine and sync well. Unfortunatly I have to reload the operating system on the machine I have the old version on.

My question is 2 fold- 1- Is there a fix for these older IPODs that will allow them to work with the newer version od ITUNES? and 2- if not, how can I get an older version of Itunes?

Thanks for any help you can give.

DumbGrunt