Personally, I would start troubleshooting it from the start.
1) Is the apache service show to be running? On the windows version does it have a hpptd.conf file? Have you made adjustments to it? How have you set up apache to handle domains? by ip or by name? Or both o.O

2) the next program that should have been installed would be mysql. Is its service showing that its running? Can you log into through command line?

3) PHP is something Im still in the process of learning. Don't have much to offer on trouble shooting it. I know theres an address you can view that will show you the php configuration on the linux version. It should be the same in windows but its slipped my mind the name of that url... google it.

4) phpmyadmin falls under the same as php as far as I can go. Generally speaking though, if you cannot access mysql through command line, your not going to be able to access it through other interfaces such as phpmyadmin.

Thats all I can offer for advice, its a good start.