I have wireless streaming set up with a WD TV Live Plus. Here is my components:
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Router: Netgear RangMax Wireless - N300 Gigabit Router with USB WNR3500L
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Wireless Adapter: Netgear Universal WiFi Range Extender WN2000RPT (connect to WD TV Live Plus via a CAT 5 cable)
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NAS: Netgear Stora with 4TB (2 x 2TB) (connect to the Router via a CAT 6 cable)
I can play any movie (1080p MKV, MTS files up to 24 mbps) without any problem. Any all computers (which are connected to the Router) can play any movie as well.
You mentioned you use a Linksys WRT54G router - that could be the problem. You may try a wirless N (300mbps) router.
Good luck.
