Open up Control Panel and type "UAC" into the search box. You'll see a link for "Turn User Account Control (UAC) on or off":
On the next screen, you should uncheck the checkbox for "Use User Account Control (UAC) to help protect your computer" then click the OK button.
You'll need to reboot your computer for the changes to take effect, and then you can continue installing Kwik*POP.
When you've finished making these changes and rebooted your computer, click here to continue, or go back to the previous page.