This document from McAfee will assist you in removing the rogue software virus Required Reading - Home User Assistance Malware Troubleshooting
please be sure to follow the steps in the document and run the McAfee Stinger scan which is included in the link.
If after following all the steps and you are still having issues then you may want to try this free program http://www.malwarebytes.org/mbam.php and you may only be able to get it installed by downloading the program onto a usb stick and when you do this you should rename the download and installation files to something you can easily remember as virus and malware are written to self protect themselves. When you rename the files the virus and malware may see these as no longer posing a threat thus allowing installation to proceed. When you get the program installed check for the latest updates and run the program and let it clean everything it finds and reboot the computer.
Let us know if you need any further assistance and good luck