Vista - Cannot add Optional Features to Vista

Hi,
I have a problem in which i can't seem to add Additional Features to Vista,
Only remove them,

I found out about this problem becuase i've removed the Tabled PC's Optional
Component from the "Windows Features" Screen, only to find that it removed
the Snipping Tool as well. Trying to add it again (Along with stuff like the
Telnet Client) resulted in an error saying: "an error has occured, Not all of
the features were successfully changed"

Has anyone else has that, or solved it ?

Thanks
Or

Hi Or,

You might perform a Repair Install to see if it will clear this problem. This will allow you to repair your Vista installation without loosing your files, settings, and programs. You may need to reinstall your drivers afterwards though.

Repair Install For Vista

Shawn