If none of the above resolves the issue, gather the following and open a ticket with Siemens Industry Online Support:
Sometimes the "basic application" is a COM/DCOM component that forgot its registration. a basic application could not be started wincc 75
The standard error message gives which “basic application” is at fault. A watchdog tool could cut troubleshooting time from hours to seconds . If none of the above resolves the issue,
Troubleshooting: "A Basic Application Could Not Be Started" in WinCC 7.5 a basic application could not be started wincc 75