It can 'only' be something interfering with the install...such as an AV that is not actually off, or some other installed proggy that is conflicting.
Either that or the OS [or you] cannot access the install files due to some permission issue.
I use Microsoft Security Essentials...and I turned it off....the flag was screaming at me! I even disabled the slides for the desktop and just put a static wall there instead.
I ran the install both as administrator, and when that didn't work, then I tried running without the administrator...same result each time....GRRRRRRR!
It's probably permissions in C:/Users/All Users. Try temporarily sharing the Stardock folder, see if that works.
That's just it....I have NO Stardock folder...Impulse never installed!
I think what I may try to do is do a system restore back to before I even tried installing Impulse....maybe something got borked somewhere....I tried installing the dang thing about 10 times already!