itunes trying to install 32-bit components on a 64-bit system

In the first link that turingtest2 gave you, see the "VC80 errors" section where it says:

The message "An error occurred during installation of assembly 'Microsoft.VC80.CRT, type="win32", version="8.0.50727.6195", publicKeyToken="1fc8b3b9a1e18e3b", processorArchitrcture=..." may occur because a particular library file is not included in the distribution package supplied with iTunes or won't install for some unspecified reason. Installing the Microsoft Visual C++ 2005 Service Pack 1 Redistributable Package MFC Security Update before attempting to reinstall iTunes may help.

There are three files to choose from so you need to select the one that matches the processor architecture of your system, which should be noted in the error message.

• vcredist_x86.EXE - 32-bit systems
• vcredist_IA64.EXE - Itanium processors
• vcredist_x64.EXE - other 64-bit systems

For general advice see Troubleshooting issues with iTunes for Windows updates.

The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Right-click on the setup file and run the installer as administrator. It may also help to pre-install the Microsoft Visual C++ 2005 Redistributable. In some cases you may also need to disable any non-Microsoft anti-virus software while installing. A couple of users found they had to uninstall their AV, disabling wasn't sufficient.

Review the other boxes and the list of support documents further down the page in case one of them applies.

The further information area has direct links to the current and recent builds in case you have problems downloading, or want to revert to an older version if the current one won't work properly for you at the moment.

Your library and device backups should be unaffected by these steps but there are links to backup and recovery advice should it be needed.

tt2