Go to your start button and type run. Then type cmd in the command box. From there you will type in a series of commands. Be sure to hit enter after each one. the commands are: cd%windir%system (enter), ren msi.dll msi.old (enter), ren msiexec.exe msiexec.old (enter), ren msihnd.dll msihnd.old (enter). You will then get a command prompt, type ‘exit’ then hit enter. Restart your computer and you should be good.