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If you receive Error 651, The modem has reported an error in Windows 10/8/7 it means that the required system driver file has failed to run. The description, the error message bears mainly reads like this – Error 651: The modem (or other connecting devices) has reported an error. The good part is you do not need to worry about it there are quite a few ways via which you can fix Error 651 in Windows 10.
1] Reregister raspppoe.sys file
2] Restart your Router/Modem
3] Use latest Drivers for the Modem
4] Reset TCP/IP or Internet Protocol
5] Run Network Troubleshooter
6] Disable Auto Tuning Feature
