My desktop has been hijacked and taken over by warnings of spyware and there is a red "X" on the bottom of my screen that constantly pops open a bubble the says "Your computer is infected!" after which it says that there is spyware on my computer. Random websites of anti-spyware materials pop up on their own. Please tell me what to do to get rid of this mess. Also, the worst part is that HijackThis won't seem to work on my computer anymore so I can't post a log. I downloaded another copy and once it installed on my desktop, I double-click on the icon and nothing happens!