XP Service pack 2 networking

I have a wireless router a desktop pc which connects via lan and a laptop.
Everything on the laptop works fine and on the desktop for that matter until
I install sp2 (I have it on seperate cd) at which point my lan adaptor on my
desktop displays a yellow triangle with an exclamation mark init. When I
move the mouse over it, it says limited or no connectivity. I've tried
repair but it doesn't work.
When I look at it's ip address it says unable to allocate 0.0.0.0. I've
reformated the drive and installed windows xp. The network works fine again,
then the minute I install sp2 I get this problem. I've even changed
motherboards and reinstalled windows and again everything works until sp2.
I've tried 3 different pci network adaptors instead of using the built in
adaptor but still I get this problem.

In all 5 cases the network adaptor was working fine according to device
manager even after sp2 and I was able to transfer files between 2 pc using
net bios instead of tcp/ip

any suggestions would be appreciated

martin

Forgot to mention. I also bought a new copy of xp pro with sp2 builtin. I
still get this problem!

"martin" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>I have a wireless router a desktop pc which connects via lan and a laptop.
>Everything on the laptop works fine and on the desktop for that matter
>until I install sp2 (I have it on seperate cd) at which point my lan
>adaptor on my desktop displays a yellow triangle with an exclamation mark
>init. When I move the mouse over it, it says limited or no connectivity.
>I've tried repair but it doesn't work.
> When I look at it's ip address it says unable to allocate 0.0.0.0. I've
> reformated the drive and installed windows xp. The network works fine
> again, then the minute I install sp2 I get this problem. I've even changed
> motherboards and reinstalled windows and again everything works until sp2.
> I've tried 3 different pci network adaptors instead of using the built in
> adaptor but still I get this problem.
>
> In all 5 cases the network adaptor was working fine according to device
> manager even after sp2 and I was able to transfer files between 2 pc using
> net bios instead of tcp/ip
>
> any suggestions would be appreciated
>
> martin
>
>