C# – Issues with class factory for component with CLSID {00024500-0000-0000-C000-000000000046}

Here is my fix for this problem:

I'm using Win 7 64bit and Office 2007

Run program "dcomcnfg -32". ( You cant find the word and excel components if it runs under 64bit)

Go to "Console Root/Component Services/Computer/My Computer/DCOM Config/" Look up Microsoft Word and Excel and choose properties.

Go to Security and select "Customize" under "Configuration Permissions. (If needed you might want to change the other permissions as well, but I didn't need to) Add "IIS_IUSRS" and give it "Full Control".

Now go to "Identity" and select "The interactive user".

Do not forget to press "OK" when done. :D

I Hope this helps you with your problem and also the rest who gets here and read this.

I'm not using a web service, but a windows service and I had the same error generated when the service called an executable that attempted to create an Excel object. I've also read many of the other resources and none of them quite worked for me. Several were very close which led me to solve the issue in the following way:

1. I went to the server...Start..Run and ran "dcomcnfg".
2. Navigate to Component Services...Computers...My Computer...DCOM Config...Microsoft Excel Application.
3. Open properties and select the Identity tab.
4. Select "The launching user" (instead of "The interactive user") radio button and click OK to close the properties dialog.

The error went away and the app produces the Excel file when the service runs.

I'm investigating if it is possible to get this working from a Windows service some other way because I'm not sure if this solution will have side effects. I will update further if I figure anything else out.