Network Connection Link has been disconnected.

Hello,

I have a Dell Dimention E520 with XP SP2.

The computer shows the message (about 30 times per hour):

"Event Type: Warning
Event Source: e1express
Event Category: None
Event ID: 27
Date:  8/25/2008
Time:  1:02:31 PM
User:  N/A
Computer: LILLOOET
Description:
Intel(R) 82562V 10/100 Network Connection Link has been disconnected.
Data:
0000: 00 00 04 00 02 00 5c 00   ......\.
0008: 00 00 00 00 1b 00 04 a0   ....... 
0010: 00 00 00 00 00 00 00 00   ........
0018: 00 00 00 00 00 00 00 00   ........
0020: 00 00 00 00 00 00 00 00   ........
0028: 1b 00 04 a0               ... "

I upgrade the drivers and the bios. I installed another NIC but I have the same message.