Automatically with the following Microsoft Fixit
Read the full KB (2642495), which also gives manual fixes and what o do if you are running Windows XP or Windows Server 2003
Error “The Windows Installer Service Could Not Be Accessed” when installing or updating programs on Windows 7 or Windows Vista
There is a hole in the bucket.
How can you install Fix It when your installer is not working?
HI JVS - any more detail?