Everytime I start up my desktop, a fake windows security center message comes up trying to get me to install a fake protection system software. When this windows security center message comes up, it also adds three shortcuts to my desktop to porn sites. This virus is hindering me from using various software such as Malwarebytes, Spybot, and it wont let me install Hijack this. Also, this virus is making Internet Explorer practically unusable (using Safari right now). Please help me, it would be greatly appreciated.