On my home workgroup, I've noticed when using the Windows 7 pc, when I type on the run line: \\computerb it doesn't find it.
But I can open CMD and ping computerb, and when I open the run line and type \\(computerb's ip), it opens just fine.

Once I've established that connection only then can I open \\computerb from the run line.

I thought dns wasn't working, but since I can ping then apparently dns is working..
Any ideas?