Troubles with streaming files to xbox360

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My xbox360 is wired into my computer running vista home premium...was able to

stream files perfectly for months..either using WMC or just the plain xbox360

media player (which i prefer over WMC)...but now my xbox360 is showing that

it is only connected to a "computer running windows media center"...and

showing that it is NOT connected to a "windows based PC"...thus only allowing

me to stream music using WMC. I havent changed any of my firewall or share

settings or Windows media player share settings...etc.

 

the moment i first came across this problem when i connected my 360 to

computer..this message came up on my computer ("wmi reverse performance

adapter maintainence utilty" not working due to application..turning off). Im

not sure if this is related to the issue or not...just started getting this

message when i came across this problem

 

Any ideas? I need some help.

???