Problem in installing iTunes on my PC

My iTunes stopped working, so I tried to do a repair (using a command in Control Panel where you can uninstall programs). When this was not successful, I decided to uninstall it and then reinstall. Now it won't install. I keep getting this error message: "Service 'Apple Mobile Device' (Apple Mobile Device) failed to start. Verify that you have sufficient privileges to start system servces. I don't know what to do next.