More information would help:
- what model of router?
- what version of Windows are the machines running?
- are the machines getting their IP addressing info from the router via DHCP, or are you entring that info on each machine manually?
- did you assign a unique computer name to each machine and assign them to the same workgroup?
- did you set up identical user accounts (including passwords) on each machine?
- If the router connects to the Internet, can both computers browse the Net correctly?
1. Keep your firewalls dropped until you get things working.
2. Make sure the two computer's IPs and the router's IP are all in the same network range. If the router is configured as a DHCP server, it should supply the correct addressing info for you; you can check the computers' IP info by opening a DOS box and typing the following command at the prompt:
ipconfig /all
3. While still in the DOS box, verify basic connectivity by pinging the IP of each machine and the router. The syntax of the ping commands is:
From computer #1:
ping IP address of router
ping IP addresss of computer #2
From computer #2:
ping IP address of router
ping IP addresss of computer #1
You should get 4 positive replies from each ping command.
4. Set up a shared folder on each machine. Once done, go back to the DOS box and try the following commands:
From computer #1:
net view IP addresss of computer #2
From computer #2:
net view IP addresss of computer #1
The "net view" command should list the available share(s) on the machine you target with command.