WinXP computers cannot network peer-to-peer, but they can do it with a windows vista computer!

I have 3 computer on a home network. 2 of them run windows XP home. Not long ago the XP computers were networking fine, now, they cannot network anymore.
Vista computer networks, shares files, and pings fine with both others but XP computers cannot network between themselves!!
One can see the name of the other -sometimes, depending on the restart... you can see all 3 computers on the network, but the 2 faulty computers cannot even ping each other by name nor IP address. Sometimes one of them could ping the other but not the other way around. Now none of them can.

Presently both all computers are set with IPX/SPX and NetBios over TCP/IP
Routing and Remote access service disabled
Computer Browser Server Automatic and running.

I have tried:
Resetting network adaptars, updating drivers, restarting all computers (that sometimes gives a bit extra visibility to one of them..)

Other notes:
When I try to browse the workgroup from the XP computers, it takes quite a while to give me the names. Sometimes I have to refresh to get all names. Then when I try to browse the OTHER XP computer I get "The network path was not found". No problem browsing the Vista computer.

I have also tried without the vista computer on, just in case, nothing.

Node Type in on both XP is Unknow, Vista is Hybrid

PS. Just tested adding registry entry to make NodeType on both XP Hybrid. No results.
abhorsen2Asked:
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debuggerauCommented:
I was thinking of the server service disking out shares, but if you cant even ping the other computer with a static IP address then there is something more low level.

I suspect the common thread would be the switch, so have you tried different ports, cables etc..
Network cards would be my last resort and I'd check the management controls of the switch (if its an intelligent one) and try disable QOS or VLAN items you might have.
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debuggerauCommented:
are the window accounts timing out?
Passwords for the accounts all the same? And not locked out?
Check the XP's >ipconfig /all to see what mode they are in..
Have you tried static ip addresses to test, that may even fix it..
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abhorsen2Author Commented:
Do not quite understand about the "timing out"... I am not even asked for a username and password... remember, not even ping...
Mode, they have been on "unknown" and I have set them up on the registry to "hybrid"

Just tried static IP's, no go...
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abhorsen2Author Commented:
Thanks debuggereau... It looks like that was it.

I did not find any thing entry lik QOS or VLAN in the router/modem (Comtrend Wireless ADSL2+ Router CT-5361T). BUT I did find an entry that said ENABLE VIRTUAL PORTS (is that VLAN?), I disbled it, and now it looks we are file sharing again, although very slow, and not in all directions.

Now TWO of the XP computers still cannot ping the VISTA computer - VISTA computer is now connected thru an Access Point, might that be the reason? ... Any further ideas? Should I remove now IPX on all machines on the network and put it back to Default, instead?

In any case, thanks so much!

Thank you so much
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abhorsen2Author Commented:
If you can provide further clarifications to my comments, that would be excellent. Thanks so much!
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debuggerauCommented:

Correct and IPX shouldn't be needed for sharing, but shouldn't hurt.
Probably Its Vista's protection thats an issue, you may want to use the network wizard to define your network as private now. it has less protection as public.

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