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File version : 2. 0. 5. 3
Description : USB Modem/Serial Device Driver
Copyright : Copyright 2001-2008
Product Version : 2. 0. 5. 3
Product Name : QUALCOMM Incorporated USB Modem/Serial Device Driver
Company Name : QUALCOMM Incorporated
Internal name : qcusbser
File Size: 119680 byte(s) 116.896 KB
MD5 : af28216f3e3842e10507c07a3585637f
SHA1: D89A0E72DD534CC1D228F8286FF81256785ADD0C

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