A few things to check:
- Have you installed the services? It can be a little temperamental the tray, but look for an install services batch file. This will get the apache and mysql services running
- Is your configuration OK? Particularly, check apache's config with
httpd -t on the command line (make sure that you're in the apache/bin folder if httpd isn't in your path)
- Have you got the correct version (32bit versus 64bit)?
- Have you checked your wamp error logs?
- Have you got the pre-requisites installed, such as the Microsoft VC++ redistributable?
If you're still having trouble, checkout the official forum (such as this post http://forum.wampserver.com/read.php?2,53095) and post there for some decent help.
