Windows Vista and 7 come with UAC which prevents malicious programs to install in your system as well as it also prevents basic users to accidentally change system critical settings which can be harmful to the system.
TweakUAC is an absolutely free software which can be used to quickly turn UAC (User Account Control) on or off, or to make UAC operate in the quiet mode:

Using TweakUAC is extremely easy: just download and run it, then select the desired option on its window and press OK.
This article was posted by VG in following section: Software, Windows Vista.
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Uewd
Can this work on Windows 7?
VG
^^ Most probably yes.
Uewd
I tested it and it worked. Thanks!