system
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Welcome ena,
First to answer your questions:
1)When I have uninstall the program, must I use the original setup or dld I a new one?
You can use the original setup if you want, also make sure you reboot the pc as you uninstall avast, then reinstall.
2)What do I whit the license, can I use the same as present?
Yes you can.
But before you reinstall avast, have you tried a repair of avast yet?, it is much faster and more convenient.
You can get to it by going to Start>control Panel>Avast>Change>Repair.
–lee