The setup failed to read IIsMimeMap table. The error code is -2147023550.

I've been facing issues with installation of Reporting service 2005 and making it run but for the first time I faced an issue while uninstalling it. On trying to uninstall I got the following error
"The setup failed to read IIsMimeMap table. The error code is -2147023550"
Solution:
1. Stop IIS Admin service
2. Stop IIS
3. Uninstall Reporting service.
Result:
Successfully uninstalled Reporting service 2005