I read a few months ago where AVAST was supposed to have a fix for running under Win 10. I have one computer running Win 10 and I have the supposed AVAST Win 10 program on it and have no problems with it. Downloaded it direct from AVAST. I also have Sybots on that computer and it will not run (even with the Win 10 upgrade). Can't get the 11R stand alone editor to run on it either. My other 2 computers still have Win 7 Home Premium running fine and have no plans on upgrading either of them. As far as I'm concerned, Win 10 is a bust for me.