Media Sharing won't activate

I'm running Vista Home Premium on a new PC (HP). I share a wired LA
with my wife's PC (Dell) that also runs Vista Home Prem. Our router is
wireless Linksys WG54, but the two PCs in question are Ethernet wired t
the router. The LAN works fine -- I share files, printers, etc.

The problem is that when I go to Network and Sharing Center in Contro
Panel and try to change Media Sharing from Off to On, it won't change.
click the arrow next to Media Sharing, then click the Change button. Th
Media Sharing dialog box appears and my other PC shows in the Share M
Media to: box. I select my wife's PC, click Allow and then OK. Tha
returns me to the main Network and Sharing Center screen, but Medi
Sharing still shows Off.

We're both running Windows Firewall. I checked the firewall setting
and there doesn't appear to be any setting there that would block medi
sharing. We're also both running AVG anti-virus and Windows Defender.

On my wife's PC, I switched Media Sharing from Off to On without an
problem when I set it up.

I would be thankful for any suggestions as to why Media sharing won'
switch to On on my PC

--
hooro
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