Are you logged on to an Administrator account? Please click the URL in my OP and then follow mechBgon's advice.

If you do not wish to install an AV please do the following.
You can use the McAfee command line scanner in DOS or Windows without having to install the program. McAfee's detection rate is very respectable, and this will allow you to leave your current AV installed and get a second opinion.
[*]Make a new folder called McAfee in the root of the c:\ drive of the computer you're going to scan.
[*]Download the
win_betaengdat.zip and extract the contents of the file into C:\McAfee
[*]Download and save this
batch file to c:\McAfee since it is responsible for launching the command-line scanner with all of its options enabled, including heuristics and adware/spyware options. You can run scan.exe /? to get a list of available options.
[*]I usually recommend starting the system in Safe Mode with Command Prompt (so explorer.exe doesn't run) and then running the command c:\McAfee\RUNSCAN.bat to launch the scanner. It'll run in normal mode too, but if malware has multiple processes that watch each others' backs, and they're running, then they'll just repair each other up after the scanner kills them off.
[*]When the scan is done, it will put a report.html file in c:\ showing what it found.
"The scanner runs faster if its window is minimized. It's normal for the text in the window to get all jumbled and overwritten. The virus definitions in this scanner get updated several times per day, and although McAfee is not our favorite anti-virus vendor in the home-user realm, they do sometimes find stuff heuristically and this does use their full threat database, for what it's worth." - mechBgon