so yesterday i noticed that when i right click it doesn't give me the "Open with" any more, it says " N152" so i thought that was weird, then i downloaded VirusBarrier and as it was scanning. i opened an software update but it wouldnt open, then VirusBarrier froze and then i rebooted my imac, after that it wont open ANY APPLICATION. NOT EVEN SYSTEM PREFERENCE. so i reset the pram and still wont open apps. then i booted with safe mode and now i can open applications. what should i do now so i can open applications using normal booting. oh and i think i lost the system cd thing that comes with the mac. ---------- oh oops i posted in Mac pro by accident. how do i move it?