Thanks - I tried the solutions and unfortunately nothing helped. I don't understand why other updates and installs all work fine, just Muse 2014.1 won't install.
I have also been trying to understand from searching the web what "Key not valid for use in specified state" means for my troubles installing Muse.
Any other suggestions? (and thanks again, kglad)
were you successful in trying all 8 solutions?
I solved the problem by restarting the computer and logging in to an administrator account. Then I was able to install Muse 2014.1
Perhaps, if this makes any sense technically, one part of the install process touched a nerve with a component in the process that required admin privileges that my day-to-day account was denying?
I hope it helps others - and I see there are a few having this problem.
Again, many thanks for your support, kglad.