One other possible culprit would be your Node Type as shown in your ipconfig /all report: Node Type . . . . . . . . . . . . : Hybrid
You have it set to Hybrid. It will work on a small LAN, but it may cause response issues.
For a small LAN with no name server, Broadcast, or B-node, makes the most sense.
Changing The Node Type
There's no GUI applet to change Node Type. You'll have to use the Registry Editor.
Click on Start > Run > type regedit
Change value:
[HKEY_LOCAL_MACHINE \SYSTEM \CurrentControlSet \Services \NetBT \Parameters \DHCPNodeType]
or,
[HKEY_LOCAL_MACHINE \SYSTEM \CurrentControlSet \Services \NetBT \Parameters \NodeType]
(which ever is there)
or add,
[HKEY_LOCAL_MACHINE \SYSTEM \CurrentControlSet \Services \NetBT \Parameters \NodeType]. -> In this case, the NodeType value would be set to Broadcast