That said, if you notice your PC is running slowly, programs or apps are crashing repeatedly or unexpectedly, or you see software or processes you don't recognize, you may have a malware infection. To identify malware and remove it from your PC, follow these steps.
Reboot in Safe Mode
Restarting your PC in Safe Mode minimizes the number of drivers and services running so you can isolate malware and reduce the risk of damage. Safe Mode is the bare minimum, while Safe Mode with Networking will allow you to access the internet if needed (to download and install malware removal software). To restart your machine in Safe Mode (on Windows 10 or 11), follow these steps:
Click Update & Security > Recovery or System > Recovery.
On the Choose an Option screen, which appears after restart, select Troubleshoot > Advanced Options > Startup Settings > Restart.
Once you enter Safe Mode, avoid logging into any apps or services, as some types of malware include key loggers or other ways of stealing your credentials from your screen or clipboard.
Privacy & security > Activity history. Event Viewer shows detailed logs of security and system activity and can be launched by searching Event Viewer in your Windows search bar. Expand Windows Logs on the left sidebar and select the category to view events.
Remove temporary files
Malware may install temporary files on your PC that allow it to hide or spread—you can find and delete these under Settings > System > Storage > Temporary Files. Click Remove Files to clear out some or all of the files. Windows also has a built-in tool called Storage Sense that will automatically clean up temporary files on a set schedule, which you should enable if you haven't already, or you can run it on demand. Under Settings > System > Storage, toggle Storage Sense on, and click Clean now to use it immediately.
On Edge, the process is similar: Settings > Reset settings > Restore settings to their default values > Reset. On Firefox, go to Menu > Help > More Troubleshooting Information and click Refresh Firefox > Refresh Firefox > Finish.
Run a malware scan
Malware scanners can identify, quarantine, and remove threats from your PC. Windows has built-in antivirus software with Microsoft Defender—via the Windows Security app—but if you suspect an infection, it may be a good idea to run a second-opinion scanner or other third-party program to detect anything that was missed.
Restart (or reset) your PC
Once you feel confident you've isolated and removed any threats, you can restart your PC. If the malware removal process is unsuccessful, you may need to start from scratch by reinstalling Windows and all apps (i.e., resetting your PC). If you restore from a backup, make sure it was created before the malware infection.
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