Virus Total:

Did u feel any suspicious file on ur system that looks different? May it be some new virus? Fear to run ur antivirus to detect that?

once u feel that the particular file may be virus.Immediately,Send that suspicious file to virustotal.com or send an E-mail to scan@virustotal.com as an attachment with the subject as scan.

Immediately, U get a report after completion of 32 different virus scanning process.This is done at free of cost.

Now u can get an idea about that file either virus or an important file.

Good luck...!