This happens since i had transferred some music files from my office laptop to my Microsoft Lumia 535; however i deleted all those files immediately, but still the issue is not resolved though i have scanned the phone using antivirus from store
There are no viruses for windows phone... So I would suggest uninstalling whatever program you installed to "scan for viruses" as it is most likely a scam.
This is problem becose you pump your memory phone and maybe you not do properly. You need to copy to Music folder on your phone. Best solution is to copy all your files on memory card but also on properly folder. Windowsphone cant search memory to all folders, he search music files in music folder.