I had this problem and i did all solutions but didn't work.
I added an alias directory and it worked for me on win8.
1.you can simply click on 'Add an alias' by clicking on Apache folder.
2.write 127.0.0.1 instead 'test ' and enter
3.point c:/wamp/www to 127.0.0.1 and enter
Forum:
WampServer English