Rpruett on 23 January 2011
Do you also have a wireless network running? Make sure the Laptop isn't connecting to the WIreless one or a different wireless one.
How is your network setup?
(IE: Modem -> Router -> 3 PCs)?
Check the security settings on the third one. Allow sharing.
Reboot your PC after you make changes.
Make sure they are in the same workgroup (MSHOME, or etc)
