Quote: Originally Posted by
fadedrs 
If you get this message it means that your "Windows Installer"
service is not enabled or not started. To fix this click Start>Control
Panel>System and Maintenance>Administrative Tools>Services>Give User Account
Control password or confirmation>Make sure the service called "Remote
Procedure Call (RPC) is on.
If "Remote Procedure Call" is stopped you can't run system in any mode.It's impossible to run computer with RPC disabled!
http://www.blackviper.com/WinVista/Services/Remote_Procedure_Call_(RPC).htm
Besides you can even change settings for RPC in services.msc because startup option are grayed for this service.You can only change service startup directly in registry