Problem in Kingston Flash RAM DT1/1GB

i copied the Imation Flash RAM password software in my Kingston Flash RAM and then give the password. after removing the flash safely when i again connect the flash RAM to my PC the following message is displayed at my computer.
NO DEVICE FOUND OR INSERT THE FLASH DISK.
although the disk is connected and icon can be seen on the PC.
please give some suggestions or any supporting software if you have.
thanks.