This is - according to other posters in other tech forums - a rootkit infection. See threads at
The removal process may not be straight forward, since there may be other malware involved. In some cases the only remedy is drastic - reformatting the disk and a complete reinstallation of all your programs. I hope that won't be necessary.
If that doesn't work there are two other tools which should help, but after using them please let us know how successful they were.
First, download and run RKill
RKill is a program that was developed at BleepingComputer.com that attempts to terminate known malware processes so that your normal security software can then run and clean your computer of infections. When RKill runs it will kill malware processes and then import a Registry file that removes incorrect file associations and fixes policies that stop us from using certain tools. When finished it will display a log file that shows the processes that were terminated while the program was running ...
Then download and tun TDSSKiller
Thanks. Hopefuly we can report back tonight with a sucessful kill.
I tried everything you suggested with no luck. McAffee keeps telling me it detected and removed trojans ZeroAccess & Generic.dx!b2pt but they keep popping up. It's slowing internet access and affecting other programs and connections it seems such as Windows Update. Do you have any other suggestions for removing?