My friend needs a proper TeX editor for Windows and I think TeXPad OSx is by far the best. Is there anything like this for Windows 7?
I think TeXworks http://www.tug.org/texworks/ would do the job.
What about TeXnicCenter?
It may not quite be quite as neat as TexPad, but then it's also free and open source.
I know this is a very arrogant idea: Use Mathematica. Just ESC LaTex ESC and you can do all calculations also with it. When you get hang of basic LaTex commands and find the best editor on the market, use it but for homeworks -- Mathematica should be totally fine!
Example about how I work with my assignments, very cool!