We've had this PC for about 1.5-2 years now, and it's always worked fine and fast. Then about a week ago it started being very, very slow. No viruses or spyware. When turning on, it's stuck on the Windows/Dell loading screen for about 5ish minutes. Today my mom called the Geek Squad and had them do a remote repair, and it's a lot better, but still a bit slow. What's a fix for this, or is it just normal slowdown?