Tonight I attempted to install the upgrade to PHP 4.3.11 which was apparently a very bad idea. This totally broke PHP no matter which version I tried to install or which method I tried. I even followed directions from a thread on the SWSoft forums, to no avail. After 30+ min of messing around with things, my only solution was to reinstall PHP to C:php and now things are working.

Anyone have any idea what is going on or how I can get PHP reinstalled properly and make Plesk happy?

I installed PHP to C:PHP to make it work (before the original post). Things are working right now, however Plesk doesn't seem to know that PHP is installed.