Trying to download update to 10.5, but installation interupted with error stating another installation is in progress. No other preocesses are running. Can you help?

Trying to download update Itunes to 10.5, but installation interupted with error stating another installation is in progress. No other preocesses are running. Can you help?

We can sometimes get past this particular message by reregistering the Windows Installer Service.
First, launch a command prompt as an administrator. In your Start search, type cmd then right-click on the cmd that comes up and select "Run as administrator".
If you have a 32 bit system
At the command prompt:
Type %windir%\system32\msiexec.exe /unregister and hit enter.
Type %windir%\system32\msiexec.exe /regserver and hit enter.
Restart the PC and try another install.
If you have a 64-bit system
At the command prompt:
Type %windir%\system32\msiexec.exe /unregister and hit enter.
Type %windir%\syswow64\msiexec.exe /unregister and hit enter.
Type %windir%\system32\msiexec.exe /regserver and hit enter.
Type %windir%\syswow64\msiexec.exe /regserver and hit enter.
Restart the PC and try another install.

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