Lan connect xp and 7 computer, computers do not appear under network.

I managed to get folder sharing between a 7 and xp computer via lan cable to
work.
It took houers, and when it worked I didn't know why.

After reinstalling xp, again I can't make the lan cable connection between
the xp and 7 computer work.

The lan has the same name on both computers, and ip on both computer are config'ed.
Icons on both computers say, that the lan connection is running.
However, if I ping the windows 7 computer from the xp computer, it
works. If I ping the xp computer from the xp computer, it works.
If I ping the xp computer from the 7 computer, it doesn't work. If I ping
the 7 computer from the 7 computer, it doesn't work.

And on the 7 computer there is an yellow triangle on the network icon.
But it was also there before reinstallation, and the lan connection worked
anyway.

How do I get the lan cable connection to work?
Thanks.

kjo said:

...If I ping the xp computer from the 7 computer, it doesn't work. If I ping
the 7 computer from the 7 computer, it doesn't work.

And on the 7 computer there is an yellow triangle on the network icon.
But it was also there before reinstallation, and the lan connection worked
anyway.

How do I get the lan cable connection to work?
Thanks.

Did you try the diagnose connection option in Win7's Control Panel --> Network and Internet --> Network Connections app?? Right click on it...

You also said early on...

After reinstalling xp, again I can't make the lan cable connection between the xp and 7 computer work.

Can you desribe what you mean by LAN cable connection... is this a PC to PC (ad hoc) network, or do you have a switch or router?

Glad you got it sorted out!