Is a virus hiding on your PC too? Here’s how to clean it up in a snap using Windows Defender—learn the full process..

If your computer has suddenly slowed down compared to before, keeps freezing, or shows unfamiliar processes in the Task Manager, you should not ignore these signs. They could indicate the presence of malware—malicious software.

Nowadays, malware doesn't always reveal itself through on-screen pop-ups; it can often silently target your data and personal information. You don't necessarily need to buy expensive antivirus software to check your PC; you can use Microsoft Defender (built into Windows) and reliable on-demand scanners.

**Check using Microsoft Defender**
Microsoft Defender comes pre-installed on Windows 11. To open it, search for "Windows Security" in the Start menu. You can then view your PC's security status in the "Virus & threat protection" section.

Microsoft Defender scans the system periodically. You can also check the "Protection history" to see what actions Windows took regarding any suspicious files or activities in the past.

Additionally, the "Allowed threats" section lists items that have previously been granted permission. If you see any unfamiliar items there, be sure to investigate them.

**Perform Full and Offline Scans**
Instead of relying solely on a "Quick scan," you can choose the "Full scan" option when necessary. This checks more files and locations on your PC, so it may take longer to complete.

If something still seems suspicious after a full scan, you can use the Microsoft Defender Offline scan. This restarts your PC and performs the scan within the Windows Recovery Environment. It helps detect threats that might try to hide during normal operation.

**Perform a secondary check with Malwarebytes**
If Microsoft Defender finds no threats but PC issues persist, you can perform a secondary check using an on-demand scanner like Malwarebytes. You can run a manual scan using the free version whenever needed. In addition to a quick scan, it offers options like custom scans and deep scans.

Quarantine or delete suspicious files
If a suspicious file is detected during a scan, you are given the option to quarantine or delete it. Before removing a file, ensure it is genuinely suspicious.

Malwarebytes' AdwCleaner can also help detect adware and similar unwanted software.

Safe Mode and removal tools can also be useful.
Furthermore, if malware cannot be removed through standard methods, booting the PC in Safe Mode and running a scan can be helpful. In Safe Mode, Windows starts with only essential services, making it easier to identify certain types of suspicious software.
Additionally, Microsoft's Malicious Software Removal Tool can be used to detect and remove common malware.
Tips to protect against malware

If Microsoft Defender and other reliable scanners detect no threats, the likelihood of your PC being clean increases significantly. However, relying solely on antivirus software is not enough.

It is equally important to avoid unknown email attachments, suspicious download sites, fake security alerts, and phishing links. Always verify the credibility of a link or file before clicking on it or downloading it.

Keep in mind that if your PC is consistently behaving abnormally, you shouldn't automatically assume it is due to malware. Hardware issues, storage problems, driver errors, or faulty software can also cause the system to slow down or freeze.

Disclaimer: This content has been sourced and edited from Amar Ujala. While we modified it for clarity and presentation, the original content belongs to its respective authors and website. We do not claim ownership of the content.