I installed the latest version of iTunes but when I go to open I get an error message saying I need to reinstall but it will not let me

So I downloaded the latest iTunes 10 version. When I go to open iTunes I get an error message C:\Program Files (x86)\Common Files\Apple\Apple Application Support\QuartzCore.dll is either not designed to run on Windows or it contains an error. Try installing the program using the original installation media or contact your system administrator or the software vendor for support. So I tried to download it again and I get a little box saying Repair or Remove and I have tried to do both but then I get an error message saying another installation is in process and to try again later. Anyone have any ideas on how to fix this?? Any help is greatly appreciated.

If you run into the "another installation" message even after the reboot of the PC (which is an excellent idea by HTP ProXy), reregistering your Windows Installer Service is worth a try.
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".
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 reinstalll.

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