How to uninstall iTunes in mac and then install again

how to uninstall iTunes in mac and then install again

You should be able to simply visit: http://www.apple.com/itunes/download/ to download iTunes, and run the installer to overwrite your previous version...
Lamborghini98 wrote:
I want this because i can't restore my iphone 4 with my mac
I don't think this will fix your problem with restoring your iPhone 4 though. That is likely a seperate issue.
but i can do it with any windows?
Yes, you can theoretically restore your iPhone with any computer running the most current version of iTunes (10.6.3) unless there is some other issue.
I get error code(21)
According to this support article: http://support.apple.com/kb/TS3694#error21:
"These errors typically occur when security software interferes with the restore and update process. FollowTroubleshooting security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service."
Do you run any anti-virus or third-party firewalls on your computer? Try disabling them and trying the restore process again. It may be possible that one of these security applications is interfering with the iPhone's ability to authenticate with Apple's servers.

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