[Win 7] Recording sound from two devices simultaneously

[Lugi]

I'm an owner of Windows 7. My audio driver is Realtek HD Audio. I'd like to be able to record sound from two sources simultaneously to the one track (let's say in "real time", so I could transmit it via skype or any other communicator), line in and mic for example. I was trying to find the solution on internet, but it looks like nobody have ever solved this. And one more thing, it's not a hardware issue, because I was able to do it in Windows XP. Please, help me.