(adsbygoogle = window.adsbygoogle || []).push({}); I need some help resolving a network problem.

Here is the situation.

Both my PS3 and PC (and girlfriends PC) are connected to my router wirelessly.
The 2 PCs can see each other and share files through the private homegroup (housemates can't access our PCs but do share the router)
My PS3 is connected to the router and can access the internet
My PS3 can see my 2 PCs but can't access them (because not part of the Homegroup)
Neither my PC nor my girlfriends PC can see the PS3..
I have shared my Videos, Music, and Games folders through the Homegroup (So my girlfriend can access my documents from her PC)

Basically what I want to do is allow my PS3 to be part of the Homegroup so I can access my videos on my desktop PC for viewing.

Any ideas what I need to do?

Both my PC and my girlfriends PC are running Windows 7 Professional. My PS3 slim is running OFW 4.11