My MBP 13" stopped showing up on network available for sharing !!

Question

It was working but now has stopped. I went into preferences > sharing and tried all kinds of permutations/combinations.
I can clearly see my MBP 15" in another room connected ON my MBP 13" but not the other way around. It just won't show up on the side bar of my other computer for screen sharing, etc.
Any suggestions? I did reboot, verfied/repaired permissions, etc. Again, thanks for any other things to share.
Hope all had a great holiday..
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Answer 1

Try the following and let me know the results
The following settings need to be enabled in the Research in Motion Network Driver connection located under Network Connections:
Client for Microsoft Networks
File and Printer Sharing for Microsoft Networks
Internet Protocol (TCP/IP)
To enable this setting in Microsoft® Windows® XP, please complete the following steps.
Go to Control Panel in Windows
Select Network Connections
In the LAN or High-Speed Internet window, select and right mouse click on the Local Area Connection that is detected as Research In Motion Network Device
Select Properties after doing a right mouse click
Ensure Client for Microsoft Networks, File and Printer Sharing for Microsoft Networks and Internet Protocol (TCP/IP) are checked
To enable this setting in Microsoft Windows 7 and Windows Vista®, please complete the following steps.
Go to Control Panel in Windows
Select Network and Internet (in Category View, if in Small or Large icons view, go to the next step)
Select Network and Sharing Centre
Under View your active networks, choose the alternative Local Area Connection x (Access type: No Internet access) that is detected as the Research In Motion Network Device
In the next window for Local Area Connection x Status, select Properties
Ensure Client for Microsoft Networks, File and Printer Sharing for Microsoft Networks and Internet Protocol Version 4 (TCP/IPv4) are checked