windows 7 reinstall

[JORDANonPC]

I am running a none legit copy of windows 7 ultimate 64 bit and have been for over a year now and over this time i have had some issues which have made me decide it will be better to just buy a legitimate copy of windows 7 home premium 64 bit and was wondering if there is anyway to install the new copy of windows without losing any of my data since im not completely sure what option of reinstall this would come under as its technically a downgrade.
 

 

EDIT: one of the main issues i have had is that some programs dont recognise the operating system and some how pressume it is linux, this happens in firefox which can cause issues with finding the right download for other programs, I also cannot watch netflix as i get the error of not having the right spefications to watch the shows, so for the mean time before i buy the legit operating system is there anyway to fix this as i would like to be able to watch netflix on my desktop as soon as possible

[Benjio]

Well it doesn't seem like it will be worth trying to fix the problem you have now. So I guess your options would be to install Linux (I don't believe it has native support for Netflix, so you'd have to go through Wine I guess, which may not work) or to install Windows again and just use it in trial mode without activating it, and just activating it once you get your key (probably the best option).

[Fulgrim]

Just keep hold of the legit copy/key and stick with your Jack Sparrow'd copy. If you need to format & re-install you can use your legit key.