Remote Desktop aka MSTSC?

Antirion gave as good an answer as I could give, so I will save my fingers and simply type "I agree"

good luck

Well, the problem is not at your home location, or you wouldn't be able to remote in from work. The problem has to lie with your friend's setup. Let's assume you forwarded the ports correctly (since you did so at home).

The most likely problem is with his ISP. Many providers block port 3389 for home users, requiring them to pay a premium for "business" service to be able to use 3389. Check to see if his provider is blocking this port. If so, there's a workaround, but it's pretty tricky (you have to change your friend's default remote desktop port from 3389 to an unblocked port (such as 65001?, anything that's open). Then you have to configure your router to redirect all traffic coming in on that port to port 3389 on your home computer. Your router may/may not permit this function. You may have to change the default port at both ends to ensure no 3389 traffic is coming or going.

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