Maybe it because default port (port 80) probably used by IIS.
Go to
wamp/bin/apache
then find httpd.conf open up with text pad or notepad then
using ctrl+F
find 80 then change 80 to 8080
and do the same thing change 80 to 8080
after it finish try to using the localhost:8080 ad the address
Forum:
WampServer English