Do you want a free anti-virus security software that can instantly check for computer viruses? You should check out Microsoft Safety Scanner.
It is a free antivirus software, always updated with the latest definitions, and requires no installation – all you need to do is copy the program executable msert.exe to an infected computer and double-click that file. If it detects a problem, the infected files will be quarantined.

You can either do a thorough scan and check each every file and folder – or a quick scan that checks a limited number of folders that are most likely to contain viruses, malware or spyware. The program expires after 10 days but you can always re-download it with the updated virus definitions.
Do Check : Top 10 Best Free Antivirus Software for Windows PC

However It won’t scan your Outlook emails or your network drives for any possible infections.
Download Microsoft Safety Scanner for free. [ Compatible with 32-bit and 64-bit editions of the Windows OS]. Downloading this program does not require check for genuine Windows.
Also see: 15 Best Free Online Antivirus Scanners