Server keeps crashing

Please can you assist.
We have a Windows 2003 server which runs Lotus Domino Server and Kerio WinRoute Firewall
Over the last week, the server has crashed twice in the middle of the night.
When we go to the server the following morning, the server is still logged on however there is a popup message:
''wrdrvapi.lib GetExtAdapterInof: Unable to read TCP/IP statistics error 1453.
I have looked in the event log and there is numerous event id 26 Application Popup :
Application popup: wrdrvapi.lib : GetExtAdapterInfo: Unable to read TCPIP statistics - err: 1453

Any ideas?
Who is Participating?
The crash may be caused by faulty ram or device driver error (ie video, sound card, modem and etc). The system event log and the minidump has the most useful diagnostic information. When Windows crashes with blue screen, it writes a system event 1001 or 1003 and a minidump to the folder \winnt\minidump. Check system event 1001 and 1003 and it has the detail of the blue screen.

Event ID: 1001
Source: Save Dump
The computer has rebooted from a bugcheck.The bugcheck was : 0xc000000a (0xe1270188, 0x00000002, 0x00000000, 0x804032100).
Microsoft Windows..... A dump was saved in: .......

Event Source: System Error
Event Category: (102)
Event ID: 1003
Error code 1000007f, parameter1 0000000d, parameter2 00000000, parameter3 00000000, parameter4 00000000

Control Panel -> Adminstrative Tools -> Event Viewer -> System -> Event 1001/1003. Copy the content and paste it back here

Zip 5 to 6 minidumps to a zip file and attach it at any webspace. I will study the dump and find out the culprit. If you can't provide the minidumps, run memtest to stress test the ram. Make sure that your windows is not infected with spyware, adware adn chkdsk /r.

Get public webspace
Use a free service like rapidshare to attach the minidumps and post the url of the mimidumps at this thread.
PolymorphexpertAuthor Commented:

Thanks for the response.

The server only crashes at the weekend.
It has just crashed again this weekend.
In the event logs, I get the below log
Application popup: wrdrvapi.lib : GetExtAdapterInfo: Unable to read TCPIP statistics - err: 1453.
Immediately after that I get entries:
Event ID 1003
Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 444553543778.  The following error occurred:
The semaphore timeout period has expired. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server.
Event ID 1000
Your computer has lost the lease to its IP address on the Network Card with network address 444553543778.

Do you think I have a faulty network card?
My only concern is that is only crashes at the weekends?

Without the minidump I can't make any comment.
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