After searching for long, I found a sollution that works with PHP v5.3.0
Search for the file libpq.dll in "C:\wamp\bin\php\php5.3.0" and copy it to WINDOWS\system32 if you're using WindowsXP. Thats all there is to it.
This apparently does not work with Windows Vista
All credit goes to Jeeba for figuring this out.
[
designbyjeeba.blogspot.com]