Computers at home connect to same router but with different names?

Hi all,

I have a strange problem.
All three of my computers at home (all on windows 7 ultimate 64bit) are connecting to the same router with same SSID, but they end up having duplicate names such as NetworkName 1, NetworkName 2, NetworkName 3. This is preventing me from having them share via homegroup.
I made sure the computer names are all different and all connect to same workgroup name.
Is this a router setting problem? i'm using a cisco-linksys wrt-160n flashed with DD-WRT. i was checking the settings and ran across a new term, vlan. could it be they are all connected to separate virtual networks? i tried to disable vlan, however, that just disconnected all the computers to the internet.

Please help me setup my home network!

Dary

You will only get a V-Lan if you setup a Vlan and you have to do it manually because you have to manually put in IP's... it is not turned on by Default using the DDWRT.

Can you take a screen shot of what you are talking about when you say NetworkName 1.. where is that showing up?

Did this problem occur before you flashed the firmware with DD-WRT?