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File version : 2. 0. 6. 7
Description : USB Modem/Serial Device Driver
Copyright : Copyright 2001-2009
Product Version : 2. 0. 6. 7
Product Name : Kyocera USB Modem/Serial Device Driver
Company Name : Kyocera Corporation
Internal name : qcusbser
File Size: 105984 byte(s) 103.512 KB
MD5 : cb68df5b3764427fd9a11c9ebe6fb5ed
SHA1: C6EDEA9C20B06F824172F2E52600FEC183D66697

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