To be truthful; it's been a while since I played it but I don't recall any issues of Dune 2 freezing or crashing.
If you wish, you could download Dune 2 from the link below. Extract it (it'll create it's own folder). Locate folder on your PC and within, double-click on the file called
!start - Dune2 will automatically start in windowed mode (press Alt + Enter to switch to full screen). This zipped file contains DOSbox and the necessary dll files.
Link:
Download Links:
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Note: btw, this is the first time I've ever uploaded anything to a file host so hope it works!
Let me know how you get on.