Windows7 64-bit OS Dial-up Connection Error(Error:777 System Error)


  • I have a Hayes compatible modem driver .inf file, which works fine for 32 bit windows7. We have a requirement to make the .inf compatible with windows 7 64 bit, for which the inf file was modified. the modifications are:

    %M27% = M27

    %M2700% = M2700, PNPC031

    %M27% = M27, ntamd64

    %M2700% = M2700, PNPC031

    %M2700% = M2700, PNPC031

    However, after setting up the Dial-up connection, i get Error:777 The connection attempt failed because the modem (or other connecting device) on the remote computer is put of order.

    The Driver details show that its refering to files:
    C:\WINDOWS\system32\drivers\modem.sys and

    I also tried adding modem driver from C:\Windows\inf\mdmhayes.inf
    (the ntamd64 sections exists here too). The same Error 777 occurs.

    Do I need to make any more changes in the .inf file ?

    Friday, September 17, 2010 11:40 AM


  • Hi,


    Thanks for the post!


    This error message indicates the modem driver is incompatible with Windows 7. Since this forum is focused on windows problems, if you want to modify the modem driver, it’s better to contact the Hayes support for further research.


    Thanks for your understanding and cooperation.


    Best Regards,

    Miya Yao

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    Monday, September 20, 2010 8:01 AM