recovery of XPPro after WindowsAntiVirusPro?

scanned again....virus has eliminated direct access to most software....get the pop-up "this file does not have a program associated with it for performing this action. Create an association file in the Folders Option control panel "

can't do that....in fact most icons in the control panel give me the same pop-up....I CAN access programs/software by "run as ".......they get the pop-up when i hit "open "