Do you have multiple drives or partitions, where parts of the programs may be seperated?
My advice would be to uninstall the other AVs. Some just don't work well with each other. Boot into safe mode w/ networking. Download malwarebytes (download in safe mode w/ networking), update it and scan.
Your other scanners could be already infected. Downloading malwarebytes while in safe mode will reduce the chance that something can get to it.
If you get it to run, then download Avira. Do the same process. Between the 2 programs, they should clean your system. After that, I would suggest downloading ccleaner and scanning your registry for any errors.
^^If none of this works, you may have to slave your drive in another PC and scan it.