Can I take wan card from acer laptop put it in dell laptop

Nope as laptop LAN (Ethernet) cards are NOT removable.

Unless he's talking about the old PCMCIA/PCCards.

Or a mini-PCI card. I've never actually tried to move one of those... but I have replaced one or two with identical cards.

Sweetcarla: What kind of card are you trying to take out of the laptop?