Already did… Even sent them a screenshot. We’re trying but, still now, no result…

<____@asw.cz> escreveu: Hello, The number is valid. Use copy & paste method to enter it into avast! and keep on mind that this number can´t be used on any server operating system. Also you have to be logged to Windows with administrators rights and the date/year indicated on your computer must be correct. And it's not pro, its por as for portugese version.

Already told him I had this problem with WinXP and Win98SE. My “old” (mar/2004) key is still working… But I’m getting worried…

The “pro” thing is because I mentioned the link I downloaded it from:
http://files.avast.com/iavs4pro/setuppor.exe

See the “iavs4pro” part?