Webcam

I have installed a webcam in my PC. Logitech Quick cam 861037-0000 is the part No.

When try to install the driver after going thru 75% it says “you do not have sufficient access to Software/Microsoft/Windows/Current Version/SharedDLLs”.

What does it mean? I tried to make a key in the registry SharedDLLs under Hkey Local Machine/…/current Version.

But the system can’t rename a key as such. It gives an error.

What is wrong in my system?
Can anyone diagnose?

Many thanks in advance.