Internet Explorer 4 error: "An internal error occurred in the Windows Internet extensions"By: Arie Slob
The error An internal error occurred in the Windows Internet extensions is in mostly caused by NetMedic. Make sure to remove syshook.exe from \Windows \ Start Menu \ Programs \ StartUp.
If you're still having problems, or don't have NetMedic:
Try reinstalling TCP/IP:
- Go to Control Panel > Network, and select TCP/IP
- Click Remove, and then OK
- After rebooting, return to Control Panel > Network, and click Add
- Select Protocol > Microsoft > TCP/IP. Click all the OK's
Microsoft has a Knowledge Base Article (188952, where they discuss some other possibilities / fixes.