If your computer is powerful enough to run PT with some VST's smoothly, you're good to go as you are.
Just make sure you exit all programs and services you don't need. For example: you don't want a notification from your virus scanner saying the latest version is downloaded when you are busy recording or mixing.

As long as the computer runs the DAW with VST's with no problem, there's no need to uninstall programs or delete data from your harddisk.

What's more important for good quality recording of music is a good quality interface. An interface is a high quality soundcard. It can be external (USB, firewire) or internal as a PC-card. Standard soundcards are not designed to record music the way interfaces are.