Stinger is a VERY useful tool. It may not be able to complete a scan though before your computer shuts down, (seen it happen

)
If this is the case, you get the reboot message, do this
Start -> Run - > command
Type shutdown -a and press enter,
This will stop the shutdown sequence, but will not prevent if from happening agina. You will need to do as often as necessary while stinger runs.
Jkrohn