My Windows 7 computer can not install the Windows 7, Service pack 1 (KB976932) for the last one and half years. It failed hundreds of times. I purchased McAfee software and now I need to install it, but it can not install the software. I called McAfee and they told that I need to have the service pack install, so McAfee can be installed after that. Please, let me know how I can install the service pack KB976932. Also, how important is this service pack 1 to run OS properly? Do I need it really?