Usually it's when the owner installs Windows but forgets motherboard and other drivers. The story is too slim to go further so have the owner tell more story.
I have a DELL Vostro with Windows7 Professional.
When ever I connect it to LAN it freezes and I have to manually restart it again.
It works fine when I connect the LAN wire when the system is powered OFF and then start it again.
My system also freezes when I try to access the systems connected to the LAN.
Any help related to the issue would be highly appreciated.