Oct 13, 2005 - 09:49:05.062 - Opening the modem device failed with error 00000002. File: C: WINDOWS system32 drivers modem.sys, Version 5.1.2600. 23:29:57.343 - Matching hardware ID: pnpc031. Sep 23, 2010 - connection driver that works fine if the PC has Windows Vista or XP OS. It gives Error 777 if the PC has Windows 7 64 bit operating system.

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I have a slightly modified version of mdmhayes.inf (available in C:/windows/inf folder) which works fine for windows vista and xp 32 bit. Now, we need this driver file to work on windows 7 64 bit OS. So the same inf file was edited in notepad to add the TargetOSversion. I added ntamd64 string to the manufacturer section as shown below.

Before ---------- [Manufacturer]%M27% = M27 [M27]%M2700% = M2700, PNPC031 after -------- [Manufacturer]%M27% = M27, ntamd64 [M27]%M2700% = M2700, PNPC031 [M27.ntamd64]%M2700% = M2700, PNPC031 i am able to add the modem driver successfully without errors. But i get Error 777 when i set up a dialup connection. Am i proceeding the right way? Is it possible to make 32 bit drivers compatible with 64 bit just by editing the inf file? I guessed so since windows 7 64 bit supports 32 bit as well via the sysWOW64.