How to reinstall iTunes with Error 2?

Question

How can I get assistance to download and reinstall iTunes on my Vista powered PC?  I had a horrible adware virus and removed iTunes only to find I get error messages telling me to uninstall and then reinstall while trying to install it. 
1. I receive an iTunes Helper Error Window when I restart my computer that says “Apple application Support was not found.  Apple Application Support is required to run iTunes Helper. Please uninstall iTunes, then install iTunes again. Error 2 (Windows Error 2).”
2. In addition, I receive a message from iTunes that says, “Service ‘Apple Mobile Device’ (Apple Mobile Device) failed to start.  Verify that you have sufficient privileges to start system services.”  The three options are ABORT, RETRY, IGNORE.  If I abort of course the install is closed.  If I retry I get the same messages.  If I Ignore I am taken back to the Error 1 above.
I want to be able to connect and sync my PC with my iPad and Android Cell Phone so I can share contacts, calendar events, music, etc.  Please direct me to where or how I might get support and instructions for these problems.
Thank You
I posed a similar request a week or so ago and think it was answered but I lost it or do not know how to find it.  Please pass along some instruction so I can receive and read and hopefully resolve my current problems.  [email protected]
PS  I also have some problems with getting iCloud mail to show my email from Outlook.  But I will request that in a separate request after resolving this problem.  Thank you in advance.  Barry

Answer 1

With the Error 2, let's try a standalone Apple Application Support install. It still might not install, but fingers crossed any error messages will give us a better idea of the underlying cause of the issue.
Download and save a copy of the iTunesSetup.exe (or iTunes64setup.exe) installer file to your hard drive:
http://www.apple.com/itunes/download/
Download and install the free trial version of WinRAR suitable for your PC (there's a 32-bit Windows version and a 64-bit Windows version):
http://www.rarlab.com/download.htm
Right-click the iTunesSetup.exe (or iTunes64Setup.exe), and select "Extract to iTunesSetup" (or "Extract to iTunes64Setup"). WinRAR will expand the contents of the file into a folder called "iTunesSetup" (or "iTunes64Setup").
Go into the folder and doubleclick the AppleApplicationSupport.msi to do a standalone AAS install.
Does it install properly for you? If so, see if iTunes will launch without the error now.
If instead you get an error message during the install, let us know what it says. (Precise text, please.)