ntvdm.exe 99% CPU

whats wrong with my NT?
Some (old) applications (a lot of setup.exe's) use the ntvdm.exe (virtual dos machine). The programs don't start and the ntvdm.exe hangs in the task manager with 99% CPU-use. The knowledge base article Q176965 from MS can help me.

Any ideas?

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schmieguConnect With a Mentor Commented:
You might only try to add one line after another and check if it still works. Don't forget to kill ntvdm.exe before you do the checks (or better restart NT).

Thanks for the points

Try running the application in protected memory to prevent your cpu from hanging.  It may be that your applications are trying to access hardware directly and this won't work with NT 4.0 resulting in a useless dos based application.  
cbo120897Author Commented:
But how should I do this, when I double-click a setup.exe in explorer? (in the past the program runs correctly!).

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In Taskmanager Processes check, if wowexec is started (under NTVDM). Check, if there are unvalid characters in config.nt or autoexec.nt. Compair these files from system32 with them in winnt\repair.
Reapply SP3 (maybe some of the WOW files have become corrupt).
Check the length of the PATH environment variable (Q169171)
cbo120897Author Commented:
Hi schmiegu,
you are right. I have many changes in the autoexec.nt done, because I would test some thinks (environment variable ...). I have copied the 'repair\*.nt' files and it works fine.

But I can't verify which entry has done this CPU stress. Any Ideas?

Please answer me with a ANSWER. I would give you the points :-)

Bye Christian
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