Your computer suddenly feels slow. Apps take longer to open. A strange pop-up appears even when your browser is closed. That’s when a virus scan stops being something you keep meaning to do.

Start With a Quick Virus Scan

If you’re checking your computer because something feels off, start with a quick scan. On Windows, open Windows Security and select Virus & threat protection. From there, choose Quick scan. The scanner checks the areas where malware is most likely to hide.

Run a Full Scan When You’re Suspicious

A full scan takes longer because it checks much more of the computer. You can start it from the same Virus & threat protection area in Windows Security. Leave the computer alone while it works, especially if you’re scanning a machine with lots of stored files.

And don’t panic if the scan takes a while. A large drive has plenty for the scanner to inspect.

What to Do If a Virus Is Found

Seeing a detection doesn’t automatically mean your computer is ruined. Security software usually identifies the suspicious file and gives you an action to take.

• Quarantine is usually the safest first choice because it isolates the file instead of letting it run.

• If Windows Security recommends removal, follow that option rather than manually hunting through folders.

• A false alarm does happen, especially with unusual software, so don’t delete something important just because its name looks unfamiliar.

Restart and Scan Again

After removing a threat, restart the computer. Then run another scan. This extra check is worth doing because malware sometimes leaves related files behind or tries to start again after removal.

Try an Offline Scan for Stubborn Malware

Some threats are designed to stay active while Windows is running. That’s where Microsoft Defender Offline becomes useful. It restarts the computer and scans before the normal Windows environment fully loads, giving certain types of malware less room to hide.

Honestly, this is the scan I’d use if a normal full scan keeps finding the same threat.

Keep your work saved first. The computer needs to restart, and nobody enjoys losing an unsaved document because they got impatient.

Keep Virus Scans From Becoming a Chore

You don’t need to stare at a progress bar every day. Keep your security software updated and let automatic protection do its job. Run a manual scan when something seems unusual or after you’ve downloaded software from a source you don’t fully trust.

Sometimes the boring five-minute check is exactly what keeps a small problem from becoming a very annoying one.