Have you tried uninstalling iTunes, then installing a freshly downloaded copy?
Is your system 32 bit or 64 bit (check by pressing the Windows key and the Pause/Break key at the same time). Make sure you download the appropriate version for your system.
Is your system 32 bit or 64 bit (check by pressing the Windows key and the Pause/Break key at the same time). Make sure you download the appropriate version for your system.
