There is no such thing as a working "Nitro Generator." If a file promises free paid services by simply running an executable, it is almost certainly a trap.
Many of these scripts also look for saved credit card info, browser passwords, and cookies. DXN'sNitroGen.exe
If you have downloaded it but haven't opened it, delete it immediately and empty your trash. If You Already Ran It: There is no such thing as a working "Nitro Generator