Entry point not found

Hi, I had contribute3 on my computer which was working fine, all of a sudden when trying to open it i get an error message "contribute.exe - entry point not found. The procedure entry point GetProcessImageFileNameW could not be located in the dynamic link library PSAPI.DLL.

I have tried uninstalling and re-installing the program but I get the same message every time.

Can you help?
fi40