These fake AV programs usually have a rootkit that will keep you from running real AV. The one I had to deal with was a variant of the TDSS rootkit. There is a special tool called TDSS_killer available on the Kaspersky AV site. Once the rootkit was disabled, I was able to run Malware Bytes and remove the virus.
You will have better luck using a different computer to download malware bytes and the other tools you will need.
Security Tool didn’t even let me bring up Task Manager. ggrrrrr