OR the alternative way is to :
Click on start menu, type diskpart in the search box,and click on the diskpart, under program bar that will appear
(NOTE:Just your memory card and keyboard and mouse were to be stay connected untill its done)
Now a screen with black background will appear
you will see a line written DISKPART_
now type- list disk ,then press enter
A list of disk will appear , under Size search for your memory volume(if its 8GB then it will be written like 8192MB),and search for its corresponding name under Disk ###
Type- select disk 1 ,press enter key
NOTE:IF YOUR MEMORY IS listed AS Disk1 then type select disk 1,if listed disk2 then type select disk2 likewise
Type: clean ,press enter key
wait for some time after cleaning is complete you will see the DISKPART_ again
Type: create partition primary ,press enter key
Type: format fs=ntfs ,press enter key
Now wait untill format completes
NOW the final one
Type:assign ,press enter key
wait for a message to show "disk part has succeded in assigning"
now remove your memorycard and have fun
i am not good at explaining hope you can understand what i typed