Hi Mohit,
WHat i can advise is for you to reformat your SD card, reformatting your SD card will delete all your files so better copy your files to your computer for Back up. Here's how you can reformat your SD.
- Connect your phone to the computer
- Go to Computer
- Do a right click on your SD CARD and click format.
- Format
Install an antivirus or a cleaner in your device to avoid Virus. hope this helps!