Take backup of your important data and try to install latest official build of windows 10. Just give it a try and hopefully, you won't need any drivers to insrtall manually but if the needs arise then some of the windows 7 and even some win vista drivers works fine in compatibility under win 10.
yes ... but that depends if you want to save on power consumption and only watch HD videos then HD 2500 shall serve the purpose but having the GT710 on your system won't harm anything anyway. What type of work you don on PC is more important but still getting a i5 3550 makes sense..
sorry for my late input and nice to know the issue has been solved but going through your post I feel like the cpu cooler somehow became loose .. hence you faced all those issues.
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