NEED HELP PLZ :X

k, my problem is the following.
I just reinstalled my pc (2 times tbh) and after putting windows xp home + motherboard and videocard drivers on it i wanted to check out my internet connection. I'm using a Lan-cable and everything seemt "ok" @ first. But then after i did a reboot (for some new installs) all the sudden my pc gives an error right after the windows logo with the loading screen and before the blue windows screen in which u can select the acount you want to work with. The error screen is dark blue and unreadable since it disapperce very quickly and my pc reboots again. If i dont remove the LAN cable my pc probably will reboot all night long ^^, which obiously isnt what i want. The interesting thing is that if wait untill windows is fully loaded and then put in the cable i can normaly use everything and stuff... rly dont know what to do... maybe u got a solution :> ?

Computer specification:
amd +3500
gigabyte GA-K8N51GMF-9
6600GT point of view
1024 mb ram


For the dutch ppl: http://gathering.tweakers.net/forum/list_messages/1159975///lan%2Ckabel%2Copstart%2Cfout

I dont understand much of it but maybe u can explain :>

and btw: everyone who has nothing to say that makes sense, just dont bother helping me :P
thx in advance