Sandisk cruzer blade 32gb - device driver software wasnot successfully instaled over and over!

my sandisk cruzer blade 32gb wont install its driver on my64-bit windows 7 os. everytime i scan for hardware changes its saids that the device driver not sucessfully installed, i unistall it already, disabled enabled and also restarted my pc and still having this problem over and over. Is there any other way to fix this problem? cause even in disk management the flash disk is not detected.