Windows 7 - Homegroup Works On One Computer

I've been trying to get homegroup to work from my main computer to my new UMPC, but it doesn't want to let me share ANYTHING from the main computer to the UMPC, only the UMPC to the main computer. My main computer is a custom built desktop and all, running Windows 7 Ultimate x64, the UMPC - Windows 7 Starter x32.

When I attempt to check one of the boxes on the homegroup page, the picture, documents, music, videos, printers as soon as I hit SAVE CHANGES it backtracks to the previous page I was on in that screen. Usually it's the Network and Internet page on the Control Panel page. Now, if I try to share a CUSTOM folder, it just NEVER shows up on homegroup at all. My computer WILL not show up on the UMPC and it act's as if there IS no other computer.

If anyone has ANY ideas on what I could do, it would be MUCH appreciated.


Main Computer :
Windows 7 Ultimate x64
4 Gigs DDR3 Ram
GTX 285 2 gig video card
AMD Athlon II X4 2.6 ghz processor

UMPC:
Windows 7 Started x32
1 Gig ram (Not sure if it's ddr3 or what)
Intel GMA 500
Intel Atom 1.33 ghz processor


Thanks,
Garbanian

Go through this Homegroup check list one item at a time and make sure everything is set up correctly. There are about a million things that can cause these types of problems including which ever A/V software you have installed.
Ultimate Troubleshooting Guide for Windows 7 HomeGroup Connection Issues

If none of that works try this.> Delate everything in the folder C:\windows\serviceProfiles\LocalService\AppData\Roaming\PeerNetworking\

You may need to restart the services listed in the link I posted after doing that.

Thanks!!!
Deleting that stuff fixed it