The other day I was trying to help an associate install Apache 2.2.6 (the httpd server) plus PHP 5.2.5 to run locally on a Vista box, but we kept having problems with error messages that said the PHP CAB file was corrupted. After some digging, it turns out that the Vista UAC security feature was getting in the way. We had to turn off the UAC completely. After that, the PHP install went like clockwork.
Do a Google search on “turn off uac” and you’ll find plenty of instructions for how to do just that, including this one: http://www.howtogeek.com/howto/windows-vista/disable-user-account-control-uac-the-easy-way-on-windows-vista/
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