I can't install AVGAS on my PC. When I try, the progress bar goes to roughly half-way along, then sits there forever. The text status says: Registering: C:\Program Files\Grisoft\AVG Anti-Spyware 7.5\context.dll and there it stays. There is no Stop, Cancel or Abort button available, so I have to kill off the install with Task Manager. Any ideas what is causing this to happen and any ideas how to get around it please?