Few questions first.
1. Do you have second computer so that you can communicate while Inspiron 570 is in parts?
Arodnom4th acquire new version of Windows and install (On overclocking I first thougt I would have to buy another version of windows 7 home, but i dont think thats the case. Right?) I do have Windows 7 64bit on my system and the ram is 4gb that came with it.
Windows 7 $???
2. What Operative System, I mean, what Windows version you have installed now on Inspiron 570? Why do you need new version of Windows?
There is one unfortunate thing - you have to install CPU, change case and install new CPU cooler all in one giant step! Because CPU cooler is too tall to fit in the original case. Or, you have to upgrade everything else first, and then do CPU, CASE, COOLING.
So, first answer please on those questions, then we will think about next steps.