UAC (User Account Control) does not get in the way every few min.. it only confirms what you are doing to make sure that the software you are running is approved... when you launch an application, it just asks if you are sure you want this program to run.. if it is a program that alters files in the Program Files (x86) directory or the Program Files directory, then you have to run it as administrator or the files will not change..
Also installing a program, if the entries to the registry are not correct, or the files corrupt on install, UAC will prompt you to reinstall using recommended settings to ensure that there is no corruption of the files or the registry.
Trusted programs you just set compatibility tab to "Run as Administrator" and when launched just say Allow.. and program runs just fine.
Turning off UAC, the system operates just like XP SP 2 or SP 3 ... but just like in XP, Win 2K3, Win 2K, Win ME, Win 98SE, Win 98, Win 95.. if you don't have UAC enabled (which is Vista and Server 2K8 only) Programs will run just like in XP, however you will not get a prompt to confirm running the application.. Installed programs may have a corrupted file or invalid registry entry and you will not know until the program locks up on you.. Also if a program is trying to install malicious or unknown content, there is nothing to CRC installs and your system can get infected..
That is why they included UAC in Vista and Server 2K8 to prevent unknown or malicious content from running without your knowledge.
There is also Windows Defender which rechecks your files and registry for corruption as well as checking for malicious software and / or trojans.. However I still prefer using Spybot Search and Destroy and Ad-Aware..
Ad-Aware is not yet available for Vista 64 bit, but it is available for Vista 32 bit.. Ad-Aware 2008 will be out in Beta next week on the 13th for 64 bit XP and Vista and Server 2K8 systems.
Like I said.. UAC is not that big of a deal as far as annoyance goes... You get use to it after a week.. however I do like how it has corrected some of the installs of software on my system.. I have yet to get a BOSD on here when I use to get them about once a week on XP..
The only problem I have had is when I was playing Hellgate London the other night with Frey and Stoneyface and I CTD.. but then again it was during my regular nightly maintainence which I forgot to disable before playing..
I do turn off UAC before I play Hellgate or Crysis, or any process intensive and graphic intesive game so I won't have any permission problems.. however I never had any problem playing them with UAC on.. but I do seem to get better frame rates with UAC turned off..
SFC, I play it with UAC on or off.. I have noticed no change in framerates or connection to the Dynaverse.. and as such, I feel playing with UAC on for that game is just fine..
I also keep UAC on when I am installing to make sure the installs go correctly without corruption.. I also use UAC when working in different software or when browsing the web.. Between the AVG Anti-Virus and UAC (no firewall).. I have yet to get anything on my system for infection, except the occasional tracking cookie..
as for software.. all programs I have installed on here work perfectly with exception of the SFC Networking issue on the D2 (GSA, TCP/IP, and Single player works flawlessly), and Dominion Wars, which won't run on Win NT kernel (which is the predominant kernel in Vista)..
Other than that.. all other games work just fine that I have installed...
KOTOR and KOTOR II works just fine.. only with KOTOR II, you have to copy the MSS32.DLL from KOTOR 1 to KTOTR II folder.. and it works perfectly.
all my other games, all the way back to Win 98SE works just fine both online and single player..
Some games UAC had me reinstall to correct installation errors from CD, but doing that, the games work better than they did on XP or Win 98.
so UAC may have a small annoyance factor, but the benifits of UAC out weigh annoyance any time, especially when it forces software to install properly and work correctly when in XP, it may or may not install correctly.