My computer just says acquiring network address when I try to connect to my router but it never connects. What should I do? It has connected before.

From the cmd prompt, try "ipconfig /renew"

My computer just says acquiring network address when I try to connect to my router but it never connects. What should I do? It has connected before.
I've tried that.

If it's a laptop and has a wireless enable push button make sure it's not turned off. That happens to me periodically.

Reset the router by power cycling as well.