There has been some discussion on the COD5 servers where I play about not using UAC. I guess people just think it's more of an annoyance than it's worth. Fact is, it's one of the primary lines of defense for our computers against malware. I hear a lot of stuff about how UAC interferes with the "normal" operation of the machine. It does not. It only springs into action when a process tries to do something that could put the system at risk, and at that moment in time, it dims the screen and pops up the familiar (and apparently annoying to many) request for confirmation to continue.
It makes me shudder that so many think this protection service is borking up their computer when, in fact, it's there to help. But why take my word for it, right? I've only been a career-long IT guy, so what do I know, lol. I'm not a security analyst, however; it's just that I've seen enough writing on the wall to be able to detect what's wheat and what's chaff. So here's an article you should read from Windows Secrets, and an excerpt from the article is pasted in below that. Please don't short-change your security, people.
The malware wars: How you can fight it
"If you are still using XP, I'd advise upgrading to Win7 or Win8 as soon as possible — XP is wide open to malware intrusions. Vista and Windows 7 [mostly] fixed this open door with the User Account Control; it pops up every time there is an attempt to make changes to your system, legitimate or not (such as when a new app tries to install). Most people just click Okay and continue, but this is one point when there's a chance of stopping an infection from entering."