If it's crashed and unusable, formatting won't help you. Formatting will just wipe the data on the disk and set it up for a file system, it won't help with a failed drive.
Format it the same as any other drive, if you have a drive to boot to, right-click on the SSD drive letter in My Computer, select format. Or boot of a Windows disk, and format during setup. Or boot of a utility disk like Ultimate Boot CD and format from there.