How to kill SALITY virus?

One day i have some trouble on my PC, i cannot install somethink which i need (ex: games), sality attack executable(.exe) file. This virus actually is old virus but with some modification this virus grow become the dangerous virus. I try to clean up and fix file which infection ever but it doesn't work yet. finally i try to clean this virus with norman malware cleaner which could you grab / download whatever do you want from the official sites norman. I hope u can end your sufferings days .