Even though your antivirus software has real-time scanning, you might not always be sure about a specific file. To make sure your antivirus app is working correctly, scan files individually.
Perhaps you have a file on a flash drive or CD – or one you downloaded. To scan just the file manually, right click it and select Scan with [your antivirus program]. In this example I’m using Microsoft Security Essentials. No matter which antivirus program you’re using, it should be listed as an option on the Context menu.
Luckily in this instance nothing malicious was detected.
If you want to make sure your antivirus program isn’t lying to you, use VirusTotal. This is an awesome service that lets you upload a file and it scans it with 43 different Antivirus and Antimalware programs. Trusted security programs like Trend Micro, Symantec, NOD32, NcAfee, SuperAntiSpyware and several more. Even some you may not heard of.
Go to the site and load your file – up to 32MB – then click Scan It!
The amount of time it takes to scan will vary depending on the file size. When it’s done, click View Last Analysis.
This gives you a report of what each of the 43 Antivirus programs found.