No drivers installed - Avast can't start!

Avast Free Antivirus / Premium Security
1

I can’t run Avast 5.1 (latest) on my computer:
2GHz Athlon XP
1GB RAM
160GB disk
Windows XP (up to date)
Installed software:
Office 2010 Professional Plus (MSDN channel, genuine)
Zemana Antilogger
Sandboxie
Device Manager shows no drivers from Avast are installed (service aswMon2 cannot be started because there is no file available).
Installation file isn’t corrupted. Is it compatibility problem?

2

Please, upload (attach) the avast log: C:\Program Files\Alwil Software\Avast5\Setup\setup.log
(or the shorter C:\Users\All Users\Alwil Software\Avast5\log\Setup.log).

If the file is too big for the forum, post the last 400-500 lines of it.