If you want to use interface Excel to import data, you need to make changes in windows.
Follow the next steps
1. Login to the server as a administrator.
2. Go to “Start” -> “Run” and enter “taskmgr”
3. Go to the process tab in task manager and check “Show Processes from all users”
4. If there are any “Excel.exe” entries on the list, right click on the entry and select “End Process”
5. Close task manager.
6. Go to “Start” -> “Run” and enter “services.msc”
7. Stop the service automating Excel if it is running.
8. Go to “Start” -> “Run” and enter “dcomcnfg”
9. This will bring up the component services window, expand out “Console Root” -> “Computers” -> “DCOM Config”
10. Find “Microsoft Excel Application” in the list of components.
11. Right click on the entry and select “Properties”
12. Go to the “Identity” tab on the properties dialog.
13. Select “The interactive user.”
14. Click the “OK” button.
15. Switch to the services console
16. Start the service automating Excel
17. Test you application again.