This is from the dink FAQ on the site:

Problem:

Dink moves too fast! I can't play like this!

Answers:

Due to some crappy timing routines Dink has problems with extremely high refresh rates. The fix depends on your graphics card, usually you can set it to "sync to refresh" and set the refresh rate to 60, or 90 or 120. Dink should work ok then.

The place to do this is probably Control Panel->Display Properties->Settings->Advanced, then look around there.

The source code to Dink has been released, so expect a fixed up version someday.