i had installed kis2009 on my pc. Now it has disappeared form system tray. I have tried to re install it but i can't, it disappears again. So i formatted my C drive and tried to install antivirus but i got the same problem, even i can't install other antivirus. And also i can't see hidden files, when i check the show hidden files and when refresh that folder files goes again hidden. I dosen't want to format entire hdd. Please prescribe the way to getting rid of this.