In httpd.conf, find the following sections and ensure they are correct:
DocumentRoot "C:/wamp/www"
<Directory />
Options None
AllowOverride None
Order deny,allow
Deny from all
</Directory>
<Directory C:/wamp/www>
Options None
AllowOverride All
Order allow,deny
Allow from all
</Directory>
Those are the settings that I am using in my install and they work fine. Make sure you restart Apache if you make any changes.
If you continue having issues, please update your original question with your httpd.conf.
Edit:
This is kludgey and I'm just grasping at straws here, but try adding a new entry to your vhosts:
<VirtualHost *:80>
DocumentRoot "C:/wamp/www"
ServerName localhost
</VirtualHost>
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