What firewall you use @Suhasingale? If not install ZoneAlarm firewall. It's the best one.
That will keep things safe from hackers. It maybe a virus also. Windows O.S with all
patches is not safe!! Since any virus/worm can attach a malicious code to any file
& execute it to deadly effect!! Use a good anitvirus & update the virus definitions.
Do a full System scan.