Sorry to hear that. For many reasons it is good practice to keep your system and everything else on seperate harddisks or partitions. Every three months or so I restore the system from a Acronis backup image, reinstall the latest applikations I want to keep and make a new backup. In that way the entropy is defeated and I get a system that is better and better over time. A side effect is that you also clean your system from all viruses (not that I ever had one). That is a must if you are using Beta software.