There's nothing special about the motherboard regarding EEPC, but you can't move a Windows drive between computers - you won't have the right drivers installed. You need to plug your drive into the same kind of motherboards to boot windows.
Even if you decrypt it, it won't boot on a different motherboard, though you will be able to copy the data off if you slave the drive.
As for recovering the machine - since it belongs to your company, Even though you know the user name and password - you still need the access code, and only they can help you with that (since it's their machine).
No, it can't be recovered with a normal Windows CD - the drive is encrypted.