Just figured I'd share this here if it helps anyone.

http://www.gog.com/forum/general/sudeki_problem

"im having issues with getting my download of Sudeki to work it says im missing the XINPUT1_2.dll what is that exactly?"

"Sounds like DirectX problem, If you havent done so already try to simply restart your computer. If that fails try to install the latest DirectX update http://www.microsoft.com/en-us/download/details.aspx?id=35"