Problems with formating samsung e250 micro sd card

Question

I am having Problems with formating samsung mobile E250 micro sd card. Whenever I try to format a card it is giving a error message. Earlier it was working fine but suddenly it has stopped working , so i tried to format the memory card but it did not worked. Can a virus in a computer can have done this when i have connected my mobile to PC. Or can mine memory card could have got damaged. I am using 1 GB Transcend micro SD card.