windows 2000 Network

I’m having problem browsing other computers on my network. I keep getting the error:”The service name is invalid”. My copmuter is the DHCP server through which other computers browse the internet. Though they can browse the net yet they cannot ping or see my computer on the network. All the computers ‘re on the same workgroup, and I can ping them from my system but can’t see them on the network. pls your response’s are needed urgently.