"trojan-bnk.win32.keylogger.gen" is not a real trojan; it's a fake name associated with one or more of the Fake AV programs, which is probably what your laptop is really infected with.
McAfee Stinger might deal with this, so try that first.
Otherwise, there is a description of the removal process at BleepingComputer,
and a McAfee Community thread about it HERE
You might try running McAfee as Administrator. This means that you need to right-click the desktop icon of McAfee on your desktop and select the option to run it as Admin. This should work and your attempt to launch anti-virus will not be blocked. See more information about this virus problem and how to resolve it - http://www.deletevirus.net/trojan-bnk-win32-keylogger-gen-virus/