Networking between Vista and Xp doesn't work

Unfortunately my vLited Vista does not work with XP in network.

Yes i have installed on XP the Networktopology responder update.

Firewall on Vista is completely disabled.

My commection says always that the connection has less connectivity.

I've given it a fixed IP adress 192.168.1.1 and 255.255.255.0.

Network connection turns always back to public network later after i've set it to private.

One more weird thing is i neither can activate networkrecognation nor deactivate it.

On my connection in the settings of MS Client there is nothing set.

Hasn't there to be Windows Locator?

Which Vista services has to run to garantee a flawless filesharing process?