You should probably look at your device manager and if you are using wireless, disable onboard LAN. I am assuming that you have a wireless adapter connected via USB? Updates always help, but won't fix device conflicts. For hardware errors, Device Manager is a good place to look. <<Start -- Programs ...

What kind of motherboard do you have? Most boards these days have onboard LAN. The port looks like a phone jack on the back of your computer. If you have an internet connection, my friend, chances are you have a NIC

Ah...in that case, a lot of servers ban "clones". If you are connecting to the same server under the same vhost, the server sees you as a clone and most servers ban for that. Use your vhost for one connection and your ip as another, or depending on how you are connecting in the first place, reattach...

Read the motd of the server and look at your eggdrop conf. You are probably inadvertantly doing something against the server's rule or it may just appear that way to their ban bots

NIC=Network Interface Card.
http://www.kellys-korner-xp.com/win_xp_stop.htm is a useful place for stop screen troubleshooting faq as well.