Windows 7 and Samsung PC Streaming

Hello all,

I've hooked up a Samsung Blu-Ray home theatre system to my home network via network cable to my modem/router. When I run the Network test on the Blu-Ray player it says the network is working fine but only picks up my Windows XP PC. It can't see my other two Windows 7 PC's. Both have media streaming turned on in the Network and Sharing Centre and I have also tried uninstalling my anti-virus software but it made no difference. Any ideas?

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