For those of who it still might not work for; I had to give full access to the SYSTEM group, not the user group (my user account already had full access). Fixing this solved the problem I had of not being able to install new programs.
Hi Cade, Do you see the permissions message? Have you restarted your IIS server. Usually it is not required but it might be on an older IIS version. What version are you on?
yes I see the permissions and for my account on windows 8 I checked on full control and the other ones then when I tried to run a program or download it says error 5: access denied.