Random error 90K

Hi!

I got some Random error 90K with my computer, but my girlfriend play with me on the same network and she didn't get the error. This is why I start to think it's not the server the problem, but the PC.

We've got the same OS Setup with the same firewall and anti-virus. She's got a old Intel computer with a Intel Core Duo E7200 with a GeForce GT630. She's playing low graphique and keep lagging a bit, but she's don't get the error 90K.

I've got a AMD FX-4100 Quad with a ATI HD6800. I can play full graphique with about a FPS 30, but I keep going with a random DC error 90000. I can't predict when the connection will crash, it's totaly at random.

Some one can tell me if he got this problem and how he solve it? Is't the network connection (physical cable), a specific setup for the firewall or anti-virus. A video driver release, or a option on the graphic setup game. Any one have a clue about this random crash?

Please help me!
Thank you!