iPod touch itouch 2g jailbroken not showing up

I jailbroke my ipod touch 2g on 4.2.1 using greenpois0n and it was syncing fine except in the past week and their have been multiple errors. First it said iTunes could not backup iphone because it was corrupt so i looked online and it said to delete backups then make a new one. i did that and it still says the same thing. so i cant restore it because i wont be able to back it up. now it says that it cant connect to this iphone because an unknown error occurred (0xE8000065).
its not showing up so i cant do anything. My itouch is working fine, its just that i cant sync, backup, connect or do anything with it thats related to a computer. My computer is a laptop Asus Eee PC Seashell Series on Windows 7 Starter. WHY IS THIS! PLEASE HELP!

unjailbreak

bmcully1 said:

theirs lots of problems with the jail breaking software because the people that design the software leave out important things like your problem and they leave people like you to deal with those problems. i would try to reverse the jail brake and then try syncing?

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how would you unjailbreak it without restoring it? i cant do that because i dont have a backup!