Okay so I had all this set up to be simple back in windows 7.
Basically, what I did was turn off password required sharing or whatever, so all I had to do was click on networks in the left side panel when i was in My Computer and click on say, my wifes laptop and it'd open the public folder she had there, and I could drag and drop stuff into and out of it. And same for her and seeing mine.
Now that I have windows 8 on my PC It's all buggered up.
I didn't change ANY settings on HER laptop, but when I try and access it (I used it to back up important files while fresh installing w8) it's asking me for a username and password