Broken download? Re-dowload it from the official location (see dosbox.sf.net)
and, while at it, download 0.71.

Thanks that was the problem. I tried 3 times with my download accelerator and it was broken all three times, but as soon as i disabled the accelerator, the program worked.

which accelerator?

I think he/she might be referring to disabling acceleration using DXDIAG.

He means a download accelerator, such as Getright etc

Yes, but i thought they should work fine with sf downloads,
maybe it's a special one therefore i was asking.