Current update of Window version 1703 will cause your USB dongle modem error. Below is the temporary solutions.
- Search for “regedit” using Cortana, then run the regedit command in the search results to launch the Registry Editor.
- Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan.
- Find the key named “RequiredPrivileges” and double-click to open it.
- Append SeLoadDriverPrivilege at the end of the line.
- Then click OK