Hi kanhaiya, and welcome to TSG.
Vodafone offers several types of modems, including various ADSL and USB G3 types. Please let us know the model number of the modem.
What operating system (version of Windows) are you running?
Assuming you are running some recent version of Windows, does the Windows Hardware Device Manager show any errors or warnings for any of the computer's hardware.
If you are using an ADSL modem, are you trying to connect to it it wirelessly or with a wired connection?
Vodafone offers several types of modems, including various ADSL and USB G3 types. Please let us know the model number of the modem.
What operating system (version of Windows) are you running?
Assuming you are running some recent version of Windows, does the Windows Hardware Device Manager show any errors or warnings for any of the computer's hardware.
If you are using an ADSL modem, are you trying to connect to it it wirelessly or with a wired connection?