Ok I tried that. Still the same result.
If you want to investigate this, I could send you the vm. It's just 75MB FreeDos Installation. It also worked a week ago, and at some Point, this particular vm started resulting in this error. Apart from that I have a Win7 32bit, Win7 64bit, Linux and MSDos 6.22 VMs and they all work.
Thx
intripoon