Disabled Network Adaptor

I have a Desktop and a Laptop in my office, both connected to the LAN. My Desktop keeps losing it's network connections. When this happens, I go to My Network Places/Properties, then Local Area Connections/Properties. I Disable the adaptor, then Enable it and my connections come back to life. Sometimes they die again in about 15 seconds and sometimes they stay connected for up to 45 minutes.

I just had a NIC card replaced today and have the same thing happening.

But, when my Desktop loses it's network connections, the ping from my Laptop still receives a reply from the Desktop. I can even Map a Desktop drive and copy a file to the Laptop, even though I cannot connect to the Internet or even use Telnet on our Lan from the Desktop.

I've been advised to Reload Windows 2000 (run a sword through my heart) , but thought I'd ask for some Help first.

 

Go over the Installation manually.

Link to: Windows Network - Installing & Sharing.