If you are using Windows 7, you may have already run into the same problem with your WAMP stack that I did.  This started when I spent the last few weeks changing from Vista to Windows 7 on my laptop.  I had to do a “custom” install, since the original version was Vista Home and I was moving to Win 7 Professional.   Almost everything is reinstalled and the system runs better (but different) than before.  There are many new paradigms, small and large, introduced in Win 7 that will take some adjustment.