If you've already ran the vundo fix and are still having problems with that file then this will take care of it for you. Go to start, run and type cmd then press enter. This will bring up a command prompt in which you can type. What you need to type is....
cacls C:\WINDOWS\system32\gebyx.dll /p guest:n
Then press enter. After you reboot that particular file will no longer run. Post another hijack this log afterwards so we can check it and also report any problems that you may still have.