It sounds like you may be trying to access your server from another PC.
If this is the case, run wamp manager -> Put online
By default wamp configures apache to only allow access from ip address 127.0.0.1, when you Put Online it will allow access from THE WORLD.
------- Original state ------
# onlineoffline tag - don't remove
Order Deny,Allow
Deny from all
Allow from 127.0.0.1
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