Unable to install itunes 10.5 after update issue. "windows installer package error"

Question

So when the update for itunes happened, it wiped my ipod, and then my ipod would not work with itunes. So I uninstalled itunes and tried to reinstall it and it gives me that error message. "There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor." I have tried all the fixes from deleting everything to running command prompts. I think i tried everything.
Method 1: Right click on the setup file and, from the drop down menu, select 'run as administrator'
Method 2: Open command prompt in elevated mode and, then unregistered and re-register Windows Installer.
1. In the Start search box and then type 'cmd', when the command application appears at the top of the start window, right click on it and, from the drop down menu, select 'run as administrator' and type each of these commands in the command prompt and press Enter
   • msiexec /unregister
   • msiexec /regserver
msiexec.exe belongs to the Windows Installer Component and is used to install new programs that use Windows Installer package files (MSI)
http://windows.microsoft.com/en-US/windows7/Command-Prompt-frequently-asked-ques tions
Method 3: Start the Windows Installer service
1. Click Start, type Services.msc and press {ENTER}
2. Double-click Windows Installer
3. Set the Startup type of Windows Installer to Manual
4. Click Start to start the service. Note down the error message if any.
5. Click OK.
If the above mentioned steps don’t resolve the issue, then
follow the steps and check whether you can resolve the issue:
Method 4: Empty your Temp directory and restart
1.       Choose Start > Computer
2.       In Computer, open the "C:" drive.
3.       Open the Users folder.
4.       Double-click the folder titled with your username.
5.       If you see an AppData folder, skip to step 10. If you don't see an AppData folder, proceed to the next step.
6.       Choose Organize > Folder and Search Options.
7.       Click the View tab.
8.       Select the option to "Show hidden files and folders." (In Windows 7 this option will be called "Show hidden files, folders, and drives").
9.       Click OK.
10.    Double-click the AppData folder to open it. If Windows needs your permission to continue click Continue.
11.    Double-click the Local folder to open it.
12.    Right-click on the Temp folder and choose Delete.
13.    In the confirmation dialog that appears click Yes.
14.    If you are unable to delete the Temp folder, close all programs, especially those in the Notification area ("System Tray") of the Windows Task bar and repeat step 12.
15.    Restart your computer.
Method 5: Removing iTunes
Note: iTunes Store purchases or songs imported from CDs are saved in your My Music folder by default and are not deleted by removing iTunes.
1.       Quit iTunes.
2.       From the Start menu, click Control Panel.
3.       In Control Panel, click Uninstall a program. The Programs and Features Control Panel opens.
Alternately, in Classic Panel of Control Panel, click Programs and Features.
4.       Select iTunes from the list of currently installed programs, then click Uninstall.
5.       When asked if you would like to remove iTunes, click Yes.
6.       After the uninstallation is complete, do not restart your computer if you are prompted to.
7.       If other program entries were listed for iTunes in Programs and Features remove those as well.
8.       In Programs and Features, also remove any iPod Updater applications that are listed in the same fashion as you removed iTunes.
Method 6: You may also try downloading the Windows Installer Cleanup utility and run that to remove the leftover ITunes installer files that may be causing issues with your current installation.
You may refer the following article to download the Windows Installer Cleanup Utility:
http://support.microsoft.com/kb/290301
1. Click on Start > All Programs and then click Windows Install Cleanup; the Windows Installer Clean Up Utility window appears, listing software that is currently installed on your computer.
2. Select iTunes from the list and click Remove. If you have multiple iTunes files, remove all of them.
3. Once you have completed the above steps to Empty your Temp directory, Completely remove iTunes and QuickTime, and Clean up iTunes installer files on the computer, you can install the latest version of iTunes from
To this:
This solution correct my bug.
I had the same error in with the i-tunes installation and i did this and it worked.... This works for any i tunes that fails to install itself on 64 Bit
You have to go into your registry.
Start, run, type in “regedit”.
Next go to HKEY_LOCAL_MACHINE.
SYSTEM
CurrentControlSet
Services
MSIServer
To the right you’ll see WOW64. Double click on it, or right click on it and click on modify. Change the setting from 1 to 0.
Next, go to the start menu again and type in the search box: “services.msc”.
Look for and find the Windows Installer service.
Double click on it and tell it to stop. Next, tell it to start.
You should now be able to install your programs.
------  By the way I dont have the WOW64 option is not available.
I was able to install quick time just fine. All of the other apple software associated with itunes installed fine but itunes did not. Im not sure if there is a virus that could do this. I didnt delete anything but apple folders.
I have tried other things but i cant remember exactly there were.
When the install process for itunes is running it changes with the error message shows up during install.
Thanks.

Answer 1

I should have posted this earlier, but anyway. I restored my laptop to factory version after backing up any useful data, and the first thing I the laptop was restored was connect to the internet, download and install the latest version of iTunes. And Bingo! It worked.
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