They say the following here:
We found that we had to disable UAC, reboot and then we were able to apply the permissions."
I have run
msconfig but I can't see where I can disable UAC.
To turn off UAC:
Variation in Recent 2008 R2:
Bart's answer describes how to turn off UAC. On the server, it really isn't a bad idea, unless you are using the server as a desktop or utility machine.
One thing not mentioned is that some applications may need to be re-installed after the change, because it does change some pretty central things in the OS.
Also, you do not want go back and forth with it. Don't turn off UAC to install an app, then turn it back on. It is very different than giving a user admin privileges to install a program.
So, if this server is already doing anything important, leave it alone and put up with the UAC warnings. As Bart's answer mentioned and I will repeat, you should not be regularly logged into a production server other than to manage that server, and then only if it really can't be done from a client with the tools installed.