If you are having problems with networking, this is almost sure to make it all work real nice. It won't hurt your computer at all.
1- Open dos prompt, type ipconfig /all.
2- Look at the 'Node Type' it probably says Peer-Peer or something (this is what mine said)
... we want it to say 'Hybrid'
3- Press 'Start' button > Run... > In the box type regedit. This opens your system's registry.
4- Navigate the tree to: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/NetBT/Parameters
5- Rt. mouse click and select New > DWORD Value
6- Name it 'NodeType' (without the quotes)
7- Rt. mouse click on it and select Modify
8- Set Value Data to '8' (no quotes)
9- Leave Base alone. 'Hexadecimal' should be selected
10- Press 'ok'
11- Close regedit and reboot. (Your done!)
12- Open dos prompt and type ipconfig /all
For node type it should now say 'Hybrid'
13- Do this to the other computer that you cannot network. Your computers should be able to see one another.