Error 0x80043800 on SAP Crystal Reports 11.5

I am unable to use the application SAP Crystal Reports 11.5. I tried to open and save all the parameter fields but was not successful. When I tried to do a refresh, a pop-up message came in saying failure to do prompting. And also, an unexpected error came in with an error source: prompt.dll Error code: 0x80043800. What must I do? I will appreciate if anyone can help me.
