My system has not been modified

Trying to install Itunes 10.5 and its been a pain. First I uninstalled the old version and now when I re-install at first it states unknown publisher and not able to download, after working on it for a while I was able to download it but now when installing it says an error has occurred while installing. "your system has not been modified".
what modification is it talking about and how can I fix this problem?
2 answers Last reply
More about system modified
  1. That quote just means nothing was altered on your computer!
  2. Turn off User Access Control, and disble antivirus while you are installing, see if that helps.
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