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File Version : 6.08
Description : LT Windows Modem
Copyright : Copyright LT 1997
Product Version : 6.08
Product Name : TOSHIBA V.90 Data+Fax Modem Version 6.08
Company Name : LT
Internal Name : ltmodem.sys
File Size: 416128 byte(s) 406.384 KB
MD5 : 6824a8b72522c8c40d77200e12efc6dd
SHA1: 83C42739D0F32364661189FEE4BFBDBF9CECC345

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How to Install lgmdmdm.sys
Repair Sys ProblemsFixing a corrupted or missing lgmdmdm.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.