❓ NVIDIA to ATi

So I just upgraded from an onboard NVIDIA 6150SE to ATi Radeon HD 5570 and I'm wondering, since I have a new graphics card from a different manufacturer, can I delete the files which have something to do with NVIDIA?

Here they are:
NVIDIA Drivers x64--3.25 MB
NVIDIA ForceWare Network Access Manager--25.14 MB
NVIDIA Graphics Driver 3-07.83 x64--138.68 MB
NVIDIA PhysX--111.06 MB
NVIDIA Update 1.10.8 x64--1.04 MB

If some are important, can you tell which I can uninstall?

Also the NVIDIA Settings is still present in the Show Hidden Icons, how do I remove it?

Also, any tips on how to speed up utorrent? Tried everything on Google but they don't work