The free online scanner provided by F-Secure quickly scans the local Windows system for any harmful viruses and displays the results.
Download it from here by clicking “Run now”.
There is no installation needed. Simply run the downloaded scanner.
Choose the interface language and hit “Start” for the scan to begin.
Wait for the scan to be finished. The scanner is lightweight and non-intrusive.
Once the scan is over, the results will be displayed. Closing the scanner will bring up the F-Secure website.
This is a free and useful online scanner. Others like this include VirusTotal.
Do give it a try and scan regularly using the local antivirus utilities as well as online scanners.