Course I guess if you have problems with the netwrok cards you Dell PC can't get onthe internet. In that case got to the site link belown and download R6677.exe , It is tha latest Intel Gigabit LOM driver for you r PC that is Microsoft Certified. Also on the same page is a Diagnostiv Utility for the NIC Card.
http://support.dell.com/support/downloads/driverslist.aspx?os=WW1&catid=5&dateid=-1&impid=-1&osl=EN&typeid=-1&formatid=-1&servicetag=&SystemID=PLX_PNT_CEL_GX270&hidos=WW1&hidlang=en&TabIndex=&scanSupported=True&scanConsent=False
Wes