Computer Running Slow? Find the Cause First
Troubleshoot a slow PC by checking startup apps, resource use, storage, updates and unwanted software.
Read the guide →General PC troubleshooting · Windows help
Computer problems have clues. Find the right next step.
Slow PC, startup failure, blue screen, missing drivers, strange error codes or a device that suddenly stopped working? Start with the symptom, check the safest basics and choose what to try next.
Start with low-risk checks · Avoid random driver downloads · Protect files before resets
$ safecode-check --symptom "PC problem"
✓ Identify the failure stage
✓ Compare one variable at a time
! Protect files before reset or repair
→ Choose the next safe check
✓ Identify the failure stage
✓ Compare one variable at a time
! Protect files before reset or repair
→ Choose the next safe check
SymptomsStart with what you see
Error codesLook up exact messages
Next stepKnow when to stop
Start with the symptom
Common computer issues
Isolate the problem before changing system settings, reinstalling drivers or resetting Windows.
Computer Won't Turn On: Check Power and Display Separately
Safe first checks for a computer that has no lights, no sound, or a blank display.
Read the guide →Windows Won't Boot or Gets Stuck on Startup
Troubleshoot Windows startup loops, Automatic Repair, spinning dots and no-boot messages safely.
Read the guide →Blue Screen or Windows Stop Code: What to Check First
Understand Windows stop-code errors, preserve the exact code and choose safer troubleshooting steps for repeated crashes.
Read the guide →Windows Update Failed or Is Stuck: Start With the Code
Troubleshoot update failures by recording the exact code, checking storage and using the built-in Windows troubleshooter.
Read the guide →Computer Keeps Freezing or Becoming Unresponsive
Diagnose random computer freezes by checking whether one app hangs, resource use spikes or the whole system locks.
Read the guide →Suspicious Pop-Ups, Fake Virus Warnings or Browser Redirects
Respond safely to fake virus alerts, scam support warnings, browser redirects and suspicious extensions.
Read the guide →Low Disk Space: Free Storage Without Deleting Important Files
Safely free Windows storage by reviewing Storage settings, temporary files, large files and backups.
Read the guide →No Sound on Windows? Check the Output Device First
Troubleshoot Windows audio by checking the selected output, volume mixer, headset connection and driver state.
Read the guide →Device Manager Error or Driver Not Working
Understand Windows Device Manager warnings and troubleshoot missing or incompatible drivers without random downloads.
Read the guide →Windows Asks for a BitLocker Recovery Key
Understand a BitLocker prompt, locate the correct recovery key and avoid data loss when Windows requests drive unlock credentials.
Read the guide →Back Up Important Files Before Troubleshooting or Repair
Create a practical backup plan before Windows resets, hardware service, malware cleanup or deeper troubleshooting.
Read the guide →Specific messages matter
Windows error-code library
Search common update codes and stop codes. A code narrows the search but does not prove one cause.
0x80070005 — Access denied
Windows or an installer could not access a required resource. The exact permission or component depends on the task.
Read the guide →0x80070002 — The system cannot find the file specified
An operation could not find a file or path it expected. The cause depends on the update or application.
Read the guide →0x8007000d — Invalid data
An operation received data it could not use. In Windows Update this may be associated with update data or cache problems.
Read the guide →0x800705b4 — Operation timed out
A Windows operation exceeded its time limit. The cause may involve update progress, connectivity, storage or another component.
Read the guide →0x800f0922 — Update or servicing operation failed
This code can have different causes depending on the operation, including servicing or system-reserved partition conditions in some cases.
Read the guide →0x800f081f — Source files could not be found
Windows could not find source files needed for a servicing or repair operation. The source depends on the feature being repaired.
Read the guide →Safer order
Before a repair utility
- Write down the exact error and recent change.
- Back up irreplaceable data before resets or disk repair.
- Use official Windows and manufacturer downloads.
- Change one thing at a time.
Know when to stop
Some symptoms carry real risk
Swollen batteries, burning smells, clicking drives, ransomware or repeated storage errors can create safety or data-loss risks.
Do not reset or format a drive just to clear a warning.
Storage and data safety →Need help narrowing it down?
Talk through the computer problem
Have the computer model, Windows version, exact message and steps already tried ready when you call.