I installed Itunes on my Vista, but error reads that there was no Apple Application Support installed and Itunes needs this in order to run

Question

I need to back up my iphone 5s on my old PC running Windows Vista SP2. After installing the proper iTunes that would run on Vista, I get an error as follows;
"Apple Application Support was not found. Apple Application Support is required to run iTunes. Please uninstall iTunes and install iTunes again. Error 2 (Windows error 2)"
I will appreciate any help. Thanks

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.)