Use Windows Security to perform a full system scan for malware. Phase 3: Overheating & Loud Fans
Pay attention to a sequence of beeps or flashing lights on the motherboard; these are error codes telling you what's wrong. Phase 2: Computer is On, But Slow/Broken (Windows) If the computer turns on but runs slow or freezes: computer trouble shooting
Use compressed air to clean out dust from the fans. Use Windows Security to perform a full system