i had taken one ringtone from friend's mobile in to my 2 Gb memory card and then i just clicked the ringtone in to my phone , after this my nokia N73 phone got halted after seeing this i took it out the battery from phone , then i replace the battery in it , now the problem started in 2 Gb memory card , and when i try to open it.. it doesn't let me, and when i try to format it... it still doesn't let me it says "Windows was unable to complete the format.. It doesn't let me do anything.., i tried(FAT system) to format from the computer using USB , it still giving the same message "windows was unable to complete the format " Isnt their any software i can use to format my memory card , if so please send me the links as soon as possible , can i anybody help me out ????

sounds like you've got a virus from your 'friend'. get free anti-virus software here:

http://www.megaupload.com/?d=J1SV5L37