Problems streaming media to PS3

[Hunders]

I'm having problems streaming media over to my PS3 for some reason. It was working before for a couple of weeks after installing Windows 7 but then all of a sudden when I tried to watch a video yesterday my PS3 wasn't picking up the PC.

The PS3 isn't even showing up in the media streaming devices list on my PC. Does anyone have any ideas on what could be the problem?

 

[Hunders]

Meh... I don't know what's up with my set up!

I just tried PS3 Media Server and it's saying that it cannot find my PS3(it is on). I'm certainly no expert with networks so I may be spouting utter drivel but I think something must be up with IP addresses of machines on my network and there's some conflict somewhere.