I do not use an automatic driver detection program, because they have a tendency to install the wrong drivers.
I look in Device Manager, and use the driver that matches THAT device, the O/S used, and is the newest version, (Date), with all the bugs worked out from an older version.
For your laptop that would be;
Ethernet Driver for Intel PRO/100 VE LAN that is the 49675 version, and has the date of November 8, 2002,
http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS002672Regards,
joecoolvette
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