Allright, you are in the paranoia stage, that happens to all builders, specially on new builds. Dont worry, it will pass.
You computer is working fine, no need to change. And that score thing is crap, dont listen to it. BTW, that "problem to fix" message on windows is also crap, dont listen to it.
Yes, RAID is great for gaming, cause it speeds loading levels, and that is even better when online gaming. FPS doenst change much tough. Nevertheless, if you have 2 or more HDDs, better to RAID them, its even better to manage under Windows Explorer.