Troubleshooting

Lists twelve fixes for a slow Windows 10 or 11 PC, from updating and scanning for malware to freeing space and trimming startup apps. It notes that older PCs with outdated hardware may not improve much, and upgrading may be the best long-term fix.

Covers why Windows might show a black or blank screen at startup, after signing in or after an update, with basic and advanced fixes.

Explains that a failing driver, device or piece of software can make Windows restart suddenly with a stop code. Gives basic checks to try and links to deeper guidance for advanced users.

Describes how to change how Windows boots for troubleshooting, including Safe Mode, which loads only essential services and drivers to help isolate a problem.

Explains how to use DISM and System File Checker to find and repair damaged Windows system files, plus how to read the CBS log and replace a stubborn file by hand.