Remote Desktop Problem!

A new computer was connected to the same router my main destop was connected to. I set up remote desktop on the new computer. It worked fine. I then moved that computer across country and set it up for someone. It connected to a router and was on DSL. Now, I cannot connect to it. Both run Win7 Pro 64. The remote desktop worked fine when both were on my router. Now, I cannot connect. The name of the computer has not changed, nor has the permission to connect remotely to it. How can I correct this problem?

Do the 2 computers have basic network connectivity? That always comes first.

Yes. They are both on home networks.

I will try those things. I did not configure the ports on either computer. Now the one is 800 miles away and used by someone even less capable than I. This will be a struggle. Thank you for your help.

Thank you. I'll try it.

Team viewer works very well. Thanks for the tip. Problem solved. Thanks everyone!