Hello: I'm looking for some informed opinions, (more informed than mine, to be sure,) on the usefulness and even the necessity of User Account Control in Windows 7 Ultimate. 1: has it really be shown to stop malware attacks, or maybe by its presence make them more difficult to create and spread? 2: Couldn't some malware program disguise itself somehow with a counterfeit identity, so that the program name that appears at the UAC prompt is falsely displayed as some other well-known program that is considered safe, leading the user to click "allow"? And finally, 3: in the very least, it slows the boot time of my machine and requires that I sit there waiting to acknowledge the prompts one by one for some of my startup programs- (a minor inconvenience if UAC actually DOES something, a waste of time if it doesn't.) At worst, some users report huge problems with it- something I've never experienced. It always seems to work OK, other than being a little tedious. I do remember once having to fix some permissions in the registry that had become screwed up, and that were making it impossible to apply an update to QuickBooks 2009. In Googling for the solution, I noticed that the issue not only affected QuickBooks, but other apps as well. The solution that worked for me said to disable UAC to make the registry changes. I didn't try the fix without disabling UAC, so I don't know if that was really necessary, or a "just-in-case" kind of suggestion. Bottom line: I'd disable the damn thing and do without it, if it really didn't do much, and gladly keep it on if it did. Thanks for your help.