A Close Look At The Windows 7 User Account Control
There is not probably a single Windows Vista user who is not annoyed by Vista’s User Account Control. Not many computer users on the other hand would say that the UAC is a waste of resources and not beneficial to system security. What Microsoft did not make right in Windows Vista was to find the right balance between annoyance and security but they promise to do better in Windows 7. The User Account Control did not get redesigned in Windows 7. It is still an integral part of the system’s security. What Microsoft did change is the amount of notifications a user receives.
They integrated a UAC slider in Windows 7 which will not display an UAC notification anymore when the user makes active changes to the Windows 7 settings. It will however still popup a notification if a software wants to make those changes. There are three additional UAC slider settings that change the amount of notifications and prompts the user receives.

The lowest setting is Never Notify Me which basically means that there will be no UAC notifications at all.

The third option is Always Notify Me which means that the user will be notified whenever he or a program want to make changes to the computer system.

The last setting is to always notify the user and wait for his response.

The sliders provide easy access to configuring the User Account Control in Windows 7. The default setting ensures that users will be less annoyed by UAC which could turn their perception of the operating system into a positive light.
Like it.. UAC was okay in Vista SP1 but, still wouldn’t use it… This is much better
i like it….a slider to control the annoyance
Seems to be cool, i’ve never been annoyed by the UAC though
I think its a good security thing that makes vista different from previous versions.
Now that’s an innovation (being mildly ironic):
-> Now users who can’t stand UAC will just choose never notify, and that’s that… Unless you’re using NoScript on Firefox i’d say: welcome viruses.
-> UAC == more security? No way, the better spyware poses as a nice little program, where the normal user will just say: “ok, no prob, let it come” to UAC question…
UAC imho is just a way of Microsoft saying: Hey, it’s not our fault you got viruses, you confirmed yourself…
Windows with or without UAC, it stays exactly the same
Sorry, Im a newbie in computer, but how come UAC is a virus thing? or spyware thing?
mumt - UAC was introduced in Vista as a safety feature because so much spyware and malware on XP was able to install itself silently with no indication to the user that something fishy was going on. UAC forced users to actively approve a program every time it tried to install or give itself elevated privileges on the system; unfortunately, many people found it popped up so much and was so annoying they found themselves just clicking “OK” without realising it.
I would imagine the new slider is intended to give power users the ability to turn off the OS’s helping hand whilst allowing less able users to choose the level of annoyance and thus keep aware.