Wierd networking problem

[SeamanV]

Here is the scenario:
Comcast cable internet, Netgear router WNR3500 v2.
Desktop A (windows 7, 64bits) is wired to router. Laptop B (windows vista 64 bits) is wirelessly connected to router, WDTV live (C) is wirelessly connected to router.
A can see B and C but cannot access them.
B can see A and C but cannot acess them.
C can see both A and B but only can access B, not A.

Anybody can help? Thanks.

 

[Maguscreed]

The WD TV Live Community – Resources - How to enable media streaming in Windows 7

Apparently win 7 is meant to stream to it, perhaps it only sees the streams sent to it.
Link above shows how they suggest doing it.

 

[SeamanV]

I check my setting (as described in the link you provided).
Everything is OK, the WDTV is allowed to access my desktop.
One thing I forgot to mention: Everything were working fine in the past (about a year), but it now just stop working.

 

[Maguscreed]

In that case the first thing that comes to mind is the firewall or antivirus possibly interfering. Sometimes they update and all the sudden decide to be a problem.

 

[SeamanV]

Look like you're right. After your post, I just found out that there is no way I can turn on windows firewall. Thinking of conflict in firewall setting, I uninstall my antivirus software (McAfee), but still the same thing: cannot turn on windows firewall, WDTV can not access my desktop.
Any other idea?

 

[SeamanV]

Bump up!
Need help, please!