ok, you probably need to add your network IP range to the trusted zone in your firewall.

double click on your firewall in your system tray then select personal firewall, and hit configure.

click on the home networking tab, and add a IP range.

in your case it would be 192.168.200.1 - 192.168.200.100

then ok

you should then be able to see your comptuer as long as you have them in the same workgroup, and have file and printer sharing enabled.