Thanks Moznewbie. I unistalled it in secure mode, run avastclear, installed 2215 back and open the options to update the virus definition file, buuuut I couldn't. The update button was disabled because Avast was very busy updating the program to version 2225.
Unfortunatly it does it automatically, as soon as it gets connection to internet.
Installing without internet connection is posible, but you can not update the virus definition file and some day I would have to go online, wouldnt I? LOL.