What should I keep?

[tmaclean]

I have a Sony Vaio Laptop (vgn-fs740/w), and I want to remove all of the Sony software because it seems to be too much overhead and causes my computer to run more slowly. After uninstalling most of it, I wasn't able to control the volume or anything else through the "Fn" key. Does anybody know which software I will need to keep in order to make the function keys work? The software I have available to get rid of is:

Vaio Central
Vaio Event Service
Vaio Light Flo Wallpaper
Vaio Long Battery Life Wallpaper
Vaio Media AC3 Decoder 1.0
Vaio Media Integrated Server 4.2
Vaio Media Distribution 4.0
Vaio Media Registration Tool
Vaio Original Screen Saver
Vaio Original Screen Saver Vaio Scene SD Wide Contents
Vaio Power Management
Vaio Registration
Vaio Support Central
Vaio Update 2
Vaio Wireless Utility
Vaio Zone Remote Commander


Thanks to anybody in advance.

-Tom