Boot Camp does not really support running Windows after it has been installed. If you were to do anything at this point it might be to install the new Boot Camp 5 drivers, however, the major changes are for Windows 8 support.
If Win7 is working for you, then it would be best to leave well enough alone.
Actually it is not working very well, i have some problems:
- A lot of times windows freezes during shut down, i have to press and hold the power button to shut it
- When i put the power cable to charge it, a lot of times it shows that it is on power but it doesn' charge. and it is definately not a hardware problem, because on macos it is ok.
- The sleep mode on windows doesn't work: it never wakes up, i have to shut it down.
- and of course the automatic graphic switch, which it would be great if Apple solve it!!
So, if any of these problems could be solved with bootcamp5, i would definately do it.
The question is: does it?
Your issues are not with the Boot Camp 4 drivers from Apple, but with your Windows installation unless you never installed the drivers. But even then the problems you are having are truly Windows related. Get your Windows installation fixed, reinstall the Boot Camp 4 drivers. Boot Camp 5 won't help you.