svchost.exe - Application Error

Hi,
I am running WinXP SP2, and have 2 network cards. I have my dsl modem
connected to my 1st network card and then my switch connected to my 2nd
network card and my wireless access point connected to my switch. That all
works fine as i can access the network from my laptop through wireless.

However when I turn my laptop on i get an error on my desktop computer
saying "svchost.exe - Application Error" "The exception unknown software
exception (0xc0000409) occured in the application at location 0x5b86a3c0" and
shuts down svchost. The taskbar then sometimes goes back to "classic look"
(instead of blue xp) and i lose internet on my laptop. I can still access the
network, its just internet that doesn't work. I've had it working before and
haven't changed anything.

How do i fix it??