clipped from: blogs.zdnet.com So, how do you wrestle back control of iTunes so that you’re not installing unneeded and unwanted junk? Your essential starting point is to unpack the installer files from the single file that Apple provides. You’ll need a third-party utility to do this. If you already have WinZip or WinRAR installed, you can use the File, Open menu to extract files from iTunes801Setup.exe (or, on x64 Windows machines, iTunes80164Setup.exe). I use the wonderful free IZArc utility, shown here displaying the contents of the 64-bit iTunes 8.0 installer.
Performing a selective iTunes install involves three steps:
1. Extract the installer files you need to a local folder.
2. Run the installers with the proper command-line switches.
3. Prevent Apple Software Update from undoing your careful work later.