Important note about User Account Control in Windows 8. THERE IS AN IMPORTANT CHANGE IN UAC FOR WINDOWS 8!
In Windows 8, you can make UAC quiescent, but you cannot turn it off from the UAC user control window. Apache will not install properly with UAC quiescent. In order to turn off UAC, I had to download a little ap called TweakUAC. It is free and it does the job. When I tried to turn on UAC after installation of Apache, neither product liked it. Even quiescent, UAC kills Apache and when UAC is not on, you can't get any of the new, splashy features that they advertise as "the big deal" with windows 8.
So, for windows 8 installation, you need to know how to turn of UAC from the inside or get TweakUAC until that command gets bundled into the Apache installation distribution or UAC and Apache learn how to play in the sandbox together. As of now, Microsoft's attitude is "old west" -- the only good Indian is a dead Indian.
"Art is the indispensible medium for the communication of a moral ideal."