here you can download avast free full version.
download here :
avast pro 7
before install crack first you need to install vcredist microsoft visual C++
how to use:
1. install avast 7 with free trial license.
2. extract crack/serial key into a directory.
3. double click "AVAST XP ZeNiX.reg" (windows xp).
4. click "Avast License ZeNiX 2012-06-29.exe".
5. and fill the password with "ZeniX" (without quote).
6. reboot your PC.
enjoy avast! :-)