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File version : 1,1,0,0 (x86 FREE) built by: WinDDK
Description : USB Modem Device Driver
Copyright : DEVGURU Co,LTD.
Product Version : 1,1,0,0 (x86 FREE)
Product Name : USB Modem Device Driver
Company Name : DEVGURU Co,LTD.
Internal name : PTDCMdm.sys
File Size: 39424 byte(s) 38.512 KB
MD5 : a6b28d696ca8a421a4229b2b75330166
SHA1: 9D9EF6B236A7111DA7AF5F4903AB4C2B50300BE6

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How to Install ptdcmdm.sys
Repair Sys ProblemsFixing a corrupted or missing ptdcmdm.sys error is an easy process with a few steps. Open the zip-file you downloaded.Extract the .sys file to a location on your computer. We recommend you to unzip the file to the directory of the program that is requesting the file.
If that doesn't work, you will have to extract the file to your system directory.
By default, this is C:/WINNT/system32/drivers (Windows NT/2000).
or C:/Windows/system32/drivers (Windows XP, Vista, 7).
Make sure overwrite any existing files (but make a backup copy of the original file)
That should be it. Although not necessary you can reboot your computer as well.