Any One can say "I Do not care about security", "I can tell when I Have spyware", BUT here is the simple truth. When your computer crashes, you cannot work, you blame Microsoft. UAC is a way to reduce users from working as ADMINs. WE all should know that you work with least privilege access, BUT we do not, Companies hate support costs, Companies buy operating system, they said make it secure and MS heard the message. I have seen message posted here saying I would like to Install P2P software on my computer and make it secure! This is almost impossible, due to the way that most P2P software works. Now working with Vista for the last 16 months I have to tell you 3-5 time a week I get UAC prompts and that not bad. Yes when I install new software I get prompted but no spyware, and my system is running much better that XP. Lets look at the history of PC software The DOS and Windows 95/ 98 were great (no security) XP had some security XP/sp2 added additional security VISTA adds Lots more Think about this. ITS A NEW operating system and you need to learn how to use NEW technology. If you want XP use XP, But VISTA is not XP it a leap ahead in the basic security model. Same happens with all software, but as up upgrade you software you need to upgrade you apps, that just the way it is. The UAC Model is as follows A user works in VISTA as a Standard user, if that user does something that requires administrator privileges they get a prompt. If you are not an admin you get a Prompt. Just like XP. To continue type a administrator user name and password If you are an Administrator You get a Give you process an elevated privileges prompt where you grant security that Process only the rest of the OS keeps running at standard user mode. This is a very large difference in that in Vista only that Process is running in elevated mode. When you are in XP the full desktop is in elevated mode. In Windows Vista you will find that once you get beyond the setup phase on most systems, you can work just fine as a standard user. The problem was what to do when the user needs to complete a task that does require the administrator privilege. To address this need, we created a new capability in Windows Vista so that when a standard user tries to do something that requires the administrator privilege, the system prompts the user to have an administrator authorize the task by entering their credentials (or confirm the task if you are an administrator). Please review these articles to further understand UACs http://windowsvistablog.com/blogs/windowsvista/archive/2007/01/23/security-features-vs-convenience.aspx http://windowsvistablog.com/blogs/windowsvista/archive/2007/01/25/accessible-uac-prompts.aspx