error - time & date - it's impossible!!

http://img179.imageshack.us/img179/6796/immaginevq3.png

but

http://img452.imageshack.us/img452/6361/immagine1ti5.png

??? ??? ??? thank you.

I think you need to move that into a windows support forum is for Linux/Unix/Mac. Trust me you will get more help if you post your question/problem in the right place.

See the tutorial: http://www.avast.com/files/tutorials/insert_key.htm
Please take a look here: http://www.avast.com/eng/faq-invalid-license-number.html

Is your system date/time correct?
Do you use copy & paste method?
Are you sure you do not include the ‘last blank space’ in the paragraph while copying & pasting?

Please, post the last 100-150 lines of avast log: C:\Program Files\Alwil Software\Avast4\DATA\log\Setup.log