While there are dozens of reasons your computer can be slowing down, here are some of our favorite initial checks: Check Disk Space Empty Recycle Bin Empty C:\Windows\Temp Empty C:\Windows\Software Distribution\Downloads Command Prompt (as Admin) DISM.exe /Online /Cleanup-image /Restorehealth DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:C:RepairSourceWindows /LimitAccess sfc /scannow Disable non-essential Services Disable 'Superfetch' service Disable all [...]