HI guys, i've got weird problem on my PC. I had Mcafee Security centre. But i was slowing down my PC. So I unistalled mcafee and installed Avast!. But i didn't like it; I decided to install Mcafee again. I uninstalled avast. When i tried to reinstall again it just stops at the beginning of the installation. and never goes on. I'm attaching the image of the installation. It necver goes beyond that screen. Pls. help.