Do you have a backup method?
At this point it would be a good idea of doing a backup, if yew can.
Other wise, reboot in safe mode. Open task manager & look for any process that might be bogus and stop it. Suspend all AV and spy ware blockers. Of course, you want to be off the network. Now run just one AV Scan program in Safe mode. Then reboot and tray again with another Scanner.
If you can not get it this way, you will have to do a Hijack log.
But first try a scan in safe mode. Yeah, I know, some will tell you that it don't work that way. Yes, it does. Trust me on this.
I would go with MalwareBytes in safe mode.