my itunes downloads, then says cant open, needs app support download ,uninstall and load again doesnt work, help!

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). If the following link takes you to the WinRAR home page rather than the WinRAR downloads page, click the Downloads header in the box at the left of the WinRAR home page to see the trial version downloads:

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.)