Depending on the exact issue at hand, a thorough Google search may be be your best bet at resolving for yourself whatever is causing dysfunction. Nonetheless, as a computer technician who runs his own business troubleshooting, repairing, rebuilding, and optimizing computers... I can probably guide you in the right direction. However, without having your PC directly at my fingertips, I can only make general suggestions. In this case, I would surely check out the highly esteemed world-class Reimage software from https://tr.im/ReimageRepair ..
When people come into our shop and drop off their PC for repair, the first thing we do is run an initial diagnostic. For this function, I use Reimage exclusively. In many cases, I am able to diagnose very quickly what is making their computer run slow, or is giving them the crashes/freezes/errors/grief that brought them to me in the first place. After the diagnostic, in a majority of cases, Reimage is able to remedy All problems and replace any corrupted Windows files. I then proceed to charge a handsome fee for my services that took me all but 30-60 minutes to complete. Obviously sometimes I must work more, but often this is all it takes. It is a very powerful tool that would likely put me and others in my industry out of business if more people knew of it. So don't tell anyone lol, and Good Luck with your PC.
Personal Experience with https://tr.im/ReimageRepair