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[DarkMatter]

There's a good chance this question has been answered many times before, so please bear with me as I was not able to find my problem in this Forum.
Ok, here's the story...
For quite some time I've been running DOSBox 0.63 without any hassles. Been working extremely well for more than a year.
Just last week I decided to install CorelDraw X3 on my machine, all went well. That is until I wanted to use DOSBox.
It keeps coming up with the error, "dosbox.exe is not a valid Win32 application".
The stupid thing here is: If I reinstall DOSBox, it works ok with no error message. If I stop using it for 10 minutes or more, the error message comes up again, so I have to reinstall again. I've since deleted CorelDraw, but I still get the same error.
A further note here: If I use DOSBox continually, or partially close the DOSBox window (and not shut it down entirely), it will continue to work with no problems. Its only when I close it off entirely is when it starts its shenanigans.
Has anyone come across the above problem and know of a fix???
Any help with the above would be most appreciated. Thanx in advance.
Regards,
DarkMatter