Kevin says his computer is running really slow using SuperFetch. Super Fetch is a memory manager that's supposed to improve performance, but in this case, it seems to not be doing the job. Leo suggests disabling it. It'll be in his services menu. If that works, then he'll know SuperFetch is the problem. More likely, because Kevin only has 4GB of RAM, running SuperFetch is slowing it down because it pre-caches.