unable to use JS for ALL browsers

Just upgraded from XP to Vista Home Premium....

I use EasyPHP/Apache to run a local webserver (for testing) on my PC. When I access HTML pages with Javascript, all of the Javascript appears disabled. This happens for all browsers I've tested with (IE7, FireFox, and Opera).

I have verified that the JS option is enabled on all browsers. If I load the exact same page that is hosted on an external webserver, the JS loads just fine, as expected.

Is there some Vista-specific option that I need to enable to allow my locally served HTML pages to have JS working properly?

Tx

-R