What to do if my PC keeps crashing?

First, check if your computer is overheating — clean dust from vents and ensure fans are working. Update Windows and all drivers. Run Windows Memory Diagnostic (search 'mdsched' in Start). Check hard drive health with CrystalDiskInfo. If crashes continue after these steps, the issue may be a failing hard drive, bad RAM, or corrupted Windows installation — all fixable by a professional technician.