If the key has already been used, you may need to contact the seller or the software developer for assistance. Ensure you purchased from an authorized source.
They are not from Combo Cleaner or any legitimate software. If you encounter one, you can often close it or, if it's a screen-locker, you may need to use legitimate security tools to remove it. This underscores the importance of only getting your activation key from official sources. activation key for combo cleaner verified