This disk is write protected

and i am not able to delete anything separately frm it too......i cant dell nythng  

If its a SD card it should have a write protection switch. Put it to off position.

You need to slide the switch indicated below so that it's in the position shown:

if you have a problem like my stepdad and me had with his memory card

for us it was probably our really cheap card reader about £5 for internal

there are 2 possible solutions

1. right-click on files/memory card and make sure that read-only is unchecked

2. after making sure the card is not hardware locked look at picture in post above, if that dosnt fix it follow on to step 3

3. you can put the card in a camera and reformat it and that will fix it, most cameras seem to ignore if the data has been flagged as read only (in software not hard ware