I cant back up my ipod touch 5 on itunes. it say "because the back up was corrupt or not compatible with this ipod". i am using windows 7, ios 7 and i didn't jailbreak it.

What can i do?

If you now go to iTunes>Preferences>Devices what is listed under backups?
You can post a screen shot if you want.
Also see the follow for more suggestions:
iOS: Troubleshooting backup issues in iTunes

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