Please update VOCALOID3 Editor and Tiny VOCALOID3 Editor to the most current version first.

Download

If that doesn't resolve the problem, the following tool called "Security Update Program" (download from the link) may resolve it. Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package MFC Security Update Program.

http://www.microsoft.com/ja-jp/download/details.aspx?id=26368

This often occurs when Windows Update (Microsoft Update) is never executed on your machine.