99.9% the tool of choice to remove these Fake Alert infections is Malwarebytes' Anti-malware. Another tool, rkill, may need to be run first in order to stop the infection processes from running to begin, and when these are used you just ignore the pop up screens until the running infection process is stopped and then continue with the tool of choice, with IS MBA-M. Each one of these Fake Alert trojans is slightly different, this one Vista Antivirus 2011 also requires a specialized registry fix first but then instructions are the same, rkill and then a Full Scan with a fully updated MBA-M and then additional tools to be sure all infection files are gone. These Fake Alerts also often indicate a rootkit, that would have to be removed first before rest of the instructions are followed.