PC is slow

Everything takes forever

Read the complete step before making changes. Stop if unsure or if new warnings appear.

Open Task Manager (Ctrl+Shift+Esc)
Press Ctrl + Shift + Esc at the same time. If only a small window appears, click “More Details.” Open the Processes section.
Check CPU, RAM, disk
In Task Manager, click the CPU, Memory, or Disk columns to display high values at the top. Observe for a few minutes. Only close programs that you know, if possible via their own menu. Do not terminate unknown Windows processes.
Check disk space on C:
Press Windows + E → This PC. Read the free memory under C:. If the drive is almost full, use the “Insufficient storage space” instructions; Do not delete Windows folders by hand.
Reduce startup apps
In the task manager, open “Autostart apps” (Windows 10: “Autostart”). Right-click on an unnecessary, known program → Deactivate. This doesn't uninstall anything. Leave virus protection, backup programs and unknown entries unchanged.
Restart Windows
Save your work. Choose Start → Power → Restart. After logging in, wait a moment before assessing the speed again.
Run Windows Update
Press Windows + I → Windows Update (Windows 10: Update and Security → Windows Update). Check for updates. Your PC may be temporarily slower during downloads and installation. Then restart when prompted.
If overheating: Check ventilation
Place the laptop on a firm, flat surface instead of on a bed or sofa. Keep ventilation openings clear. Turn it off before cleaning externally. Do not open the device as a beginner. If you smell burning, are overheating severely or the battery is swollen: stop using it and get specialist help.