Tell us about yourself!
Are you sure you typed the commands correctly? If so, the antivirus might have kicked you out.
Just google it :)
I think you tried to hack a computer that has an other operating system than windows xp. If you want to hack a computer with windows 7 or higher installed, take a look at my other tutorial: https://www.instructables.com/id/Hack-Windows-7-or-Higher-With-SeToolkit/.
Learn VBS programming for pranks, cool stuff, ect.