I refer not to one single flaw but a bunch, Windows has had a long running issue that keeps popping up again and again to do with privilege elevation.
One example is this patched flaw
http://www.zdnet.com/aprils-patch-tuesday-to-fix-two-critical-flaws-in-windows-ie-7000013594/
Quote: "The second critical update affects Windows XP (Service Pack 3), Windows Vista (Service Pack 2) and Windows 7 — but not Windows 8 or Windows RT-based devices, such as Surface tablets. The patch will fix a flaw that allows an attacker to elevate privileges, such as from the more secure "user" to "administrator" privileges, opening up the core system files to attack and thus a greater scope for malware injection."
The flaw allows the malware access to the registry and other system files with which it can permanently disable UAC.
There are many others like this flaw and more appear every month as Microsoft can't seem to fix this issue. I will try see if I can find the article I was reading on the new one they found in Windows 7 and Windows 8 last month. Just do a search for Windows privilege elevation and you will see Windows appalling history, not that this is limited to only UAC far worse things can be done but the point still stands.
Windows simply isn't secure there are far too many ways to elevate privileges that Microsoft doesn't know about hence why UAC is pretty useless.
Not to mention that UAC doesn't stop some things that are running from areas outside Program Files so the malware can just hide other places and do it's dirty work and UAC won't alert you
Sorry to OP for hyjacking your thread a bit, I am sure we can agree to disagree, I have nothing against people using UAC or even liking it, just so long as you know it is broken and hackers can get around it without too much hassle.
Also sorry if this has grammatical mistakes I am on my phone.
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