Hello! It sounds like you have something clogging the works, be it a virus or some temporary files. Go to www.malwarebytes.org and download the free antivirus, update and scan, follow directions for removal of it finds anything. Then go to www.piriform.com/ccleaner and download ccleaner. Run that, and be sure to run the temporary file cleaner, and the registry repair tool, in the registry tab. Restart the computer, then try your update again!