I recently reset my Windows 10 machine and kept all of my old files. Today, I went into CCleaner and ran a cleaner, and told it to remove Windows.Old. After the clean, the Windows 10 Mail app randomly shut down and would not open up again, so I restarted the computer. It has been at the logo screen with the spinning dots for well over 4 hours now. I have tried restarting, but the same thing happens. What can I do?