Streamlining Windows Vista

I'm trying to experiment in which configuration works best for me. I am able remove components from the installation source. This will enable Vista to be come snappier. I just can't figure out which among the services are essentially needed for seamless integration with Parallels Desktop & Tools. Which among them has a direct impact on Parallels? As of present, the shortcut icon for shared folders is gone and I can no longer drag & drop files from windows to MAC and vice-versa. Haven't tried networking yet. Parallels tools has been installed though.

 

Do not edit in registry any prlxxx services