ntvdm problem

OS: MS Windows Vista Beta 2.
After installing Avast 4.7, I receive an error msg when trying to load legacy DOS programs (“NTVDM encountered a hard error”) and program will not load. From
another forum I learned that this is caused by a line Avast adds to the System32 config.nt file (“device=F:\PROGRA~1\ALWILS~1\Avast4\aswmonds.sys”) What is the purpose of this line and will Avast still work if I REM it out?

Not sure if this is relevant to Vista or if this is the one you found.
XP SP2 & 16BIT PROBLEMS - http://forum.avast.com/index.php?topic=6991.msg55146#msg55146