You might have misconfigured it when you changed apache/php config, or probably it's conflicting with another port (usually Skype or what).
Port problem or mysql not started. Left click on wampserver and apache > service > test port 80. You will get which service using your port.
First please check whether Skype is working or not.. If it is working then just quit it and start wamp, It will work.
I am having trouble with installing WAMP, tried all tutorials on there site but not able to make it work.
And that is basically "right" - what are we supposed to do with that information? First, which version of Wamp? Latest? If so, what happens - error? Doesn't the services start? What does the reports and tests say? What does error-logs say? "It doesn't work" is NOT helpful. Especially when you've been working with customer service for way too long - users usually say "it doesn't work" whenever something is behaving differently than what they expected - regardless of whether or not there's an actual error, or they just don't get it. More information, please!
abdulferhan & jazzyjmnote, please post your log files you can find them like this click on the sys-tray icon and roll your mouse over the apache folder: Under the Service folder the option to test port 80 (mentioned by popsicle) is found there. click this and tell us the message you get back. Where it says Apache Error Log & Apache Access Log click those and post the files it shows you. Now roll mouse over Php Folder: Where it says PHP Error Log click this and post the file it shows you. Finally roll mouse over Mysql: I'm sure your getting it now but just one more time, where it says MYSQL Log click and post the file. We want be helpful but without detail of your problem we can only guess. Abs