sorry to here
install Kaspersky Internet Security 2012 and scan ur PC
Write all the details which ever you can mention to FF and RS Support
Like the day you have purchased, the email through wich u have send money to em and stuff. Before anything happens change Paypal pass ( if you got Keylogger in ur PC, chnaging Paypal pass will not help you)

Quick Tip:
change Paypal pass from another PC (or at-least by phone)