Posted by:
yfastud
(---.cable.mindspring.com)
It's not easy to help when you didn't tell exactly what you've done.
Anyway, did you perform all needed basic steps yet? Disable Windows firewall if any, enable port 80 in 3-party firewall (i.e Norton, McAfee), enable portforward in router, setup Virtual Host in httpd.conf in wamp/apache2/conf, so on. If you miss any basic step here, do it and post back here.
Hope this help.