Hey revendh. Have you tried formatting the SD card via CMD (Command Prompt)? Here's a link with instructions on how to do that:http://www.ehow.com/how_5838128_format-sd-card-command-prompt.html
Some manufacturers have formatting tools for their cards, so you might try this as well to see if it fixes the issue.
Unfortunately there might be the possibility that the card might have failed as well, but hopefully this is not the case this time.
Hope that helps.
Boogieman_WD