DASYLab 12 was never tested on Windows 10.
We had that problem with DASYLab 13 on Windows 8, so I assume that's it's related. I have a patch for DASYLab 13, but not 12, since Windows 8 and later were not supported by DASYLab 12.
Your only option is to update to DASYLab 2016, which does list Windows 10 as a supported operating system.
I wish that I had better news.
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