Peer to peer stopped working,

Running peer to peer network through a cross over calbe. Both systems were working and able to see each other. One system is running XP the other Windows 98. Now my 98 machine won’t show up in the network on the xp machine, however I can ping it from the XP machine. My XP shared files will appear and can be accessed on the 98 machine, however I can’t ping the XP machine from the 98 machine, I get an error code of 10050. As a side note does nayone know were I can get a listing of the PING error codes and there meanings.

Thanks
Bill