Start by identifying when it is slow

A computer that is slow from the moment it starts has different likely causes from one that slows down only in a browser or one application. Restart once, wait several minutes after signing in, and test before opening your usual programs.

If the computer becomes slow only after opening a particular program, that application, its data or an add-on may be responsible. If everything is slow — including opening folders and Settings — look first at storage space, background activity, updates and drive health.

Safe checks to perform

  1. Check free space. Open Settings → System → Storage. Try to keep at least 10–15% of the Windows drive free.
  2. Check Task Manager. Press Ctrl+Shift+Esc and look at CPU, Memory and Disk. Note the name of anything that remains unusually high; do not end unfamiliar system processes at random.
  3. Review startup applications. In Task Manager, open Startup apps and disable only non-essential programs you recognize. Do not disable security or driver components without checking.
  4. Install official updates. Use Windows Update, restart, and test again. Avoid third-party “driver updater” or “PC cleaner” programs.
  5. Check the browser separately. Too many tabs, extensions or a damaged browser profile can make the entire computer appear slow.
A useful clue: If Disk stays at 100% for long periods while CPU and memory are moderate, the drive, an update, indexing or a background scan may be the bottleneck.

Could it be malware?

Sudden slowdowns accompanied by new pop-ups, browser redirection, unknown applications, disabled security or unexpected account activity should be treated as a security concern. Use Windows Security or your trusted installed security product. Do not download an unknown cleaner from an advertisement.

When to stop

Stop routine troubleshooting if you hear clicking or grinding, Windows reports drive errors, files disappear, the computer repeatedly crashes, or there is unusual heat or a burning smell. Continuing may increase the chance of data loss or physical damage.

Protect important files first. If the drive may be failing and files are still accessible, avoid repeated restarts and heavy scans until a safe backup or recovery plan is decided.

Can this be fixed remotely?

Performance problems caused by startup programs, storage pressure, updates, browser settings, applications and many malware concerns can often be assessed remotely. Physical drive failure, overheating or electrical problems require hands-on inspection.

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Reviewed by Gemenev technical supportPractical guidance based on remote computer, operating-system and business IT support experience.