DON'T do System Restore yet ! You might find after doing it, the issue still persists... LOL, damn Windows.
UAC is blocking... I think.
Installer is asking Windows for resource access to which it does not have permission, so Windows blocks it.
That installer requests access to something that most installers do not or it is a quirk between Windows and that particular installer.
If you know installer is safe, try renaming to * Installer* without asterisks.
If that doesn't work, and installer is safe, turn off UAC and try install again. (I see you tried already...)
IF it works, remember to re-enable UAC.