Cannot connect two computers to network

I am trying to connect two computers to each other that both use windows 7. I'm wondering about when it asks me for a username and password, and because there is no password, we put ion the username and left password blank. Then it brought us to another window that asked for a username and password, and we could not go any further. How do I get them connected? and is it safe to set the password protected file sharing to 'off' or do I run the risk of someone hacking into my network? Thank you.

I am trying to connect two computers to each other that both use windows 7

But your Subject says you want to connect to a network.

If wanting to connect the 2 computers only to each other you could try an Ethernet Cross-over cable or maybe a LapLink USB cable.