See my message at .exe forum line. I repeat it here because it works perfectly 
Fantastic!!!

The very best advice! Works perfectly!
When I notify the first time, my config.nt - except the comments (REM) - myhas the following lines:
dos=high, umb
device=%SystemRoot%\system32\himem.sys
files=40
because, Avast was not installed. After I install, the file config.nt immediatly changed with another line (with my correct path):
device=x:\short_path_to_avast4\aswmonds.sys
I booted and tryed to use Avast. Nothing changed, I could not use DOS .exe. When I put a REM before the line:
REM device=x:\short_path_to_avast4\aswmonds.sys
the executables works perfectly! 
Very best thanks to Jindrich Kubec! :o
Did I lost any Avast features?
Everything seems to work fine…
The best Antivirus Help and Support! 8)