This version of C:\miners\rpcminer nvopt\rpcminer-mod-cuda.exe is not compatible with the version of Windows you're running.
Er..odd. Nothing changed since last version working from yesterday?
Can you download Dependency Walker from
http://www.dependencywalker.com/ (the x86 version) and run it and open the rpcminer-mod-cuda.exe file and see if you get any errors. An error is typically a file shown in red in the top left tree.