HOME NEWORK LOCKS UP CURSOR ON DELL

INSTALLED LINKSYS 10/100 NETWORKEVERYWHERE NIC AN PC CARD AND USING CROSSOVER RS-45
WHEN LAPTOP ACCESS NETWORK CURSOR FREEZE ON DESKTOP BUT MOUSE
(LOGITECH WIRELESS SURFMAN) IS WORKING BY OPENING PULLDOWN MENUS

WHERE SHOULD I LOOK TO SOLVE PROBLEM?

ANY HELP BE APPRECIATED