I tried three times deleting the download file and re-downloading and installing but get the same result with antivirus off, and even the firewall off. When I go to the temp folder as above I click on the RM7Setup.exe file and get this "The version of this file is not compatible with the version of Windows you're running. Check your computer's system information to see whether you need an x86 (32-bit) or x64 (64-bit) version of the program, and then contact the software publisher."
So I check system information and sure enough I am running 64-bit operating system which I knew but I thought I better go through the motions. I am running RM7.2.2 and Win7 Service pack 1 btw
Any other ideas I can try? I was toying with the idea of compatibility mode (Windows 7 - not the Service pack version) but don't want to mess things up. Incidentally, what I didn't mention is that I tried to update RM before this latest update and that had the same result so I just gave up because I could treesync Ancestry. I think my next move might be to try and instal in safe mode. I shall keep you posted.