Start with the symptom, then check the simplest measurable cause first.
If the PC is slow
Open Task Manager and check CPU, Memory, and Disk. The number that stays high tells you what to fix first.
- High CPU: close heavy apps, browser tabs, installers, and background updaters.
- High Memory: reduce startup apps and consider adding RAM if usage stays near 85-95%.
- High Disk: free space, wait for updates to finish, and check whether the PC still uses an HDD.
Before downloading repair tools
- Use Windows built-in tools first.
- Prefer official manufacturer driver pages.
- Avoid “one-click fix” utilities unless you understand what they change.
- Make one change at a time and restart before judging the result.