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File Version : V4.34
Description : Sony Ericsson W550 USB WMC Modem WDM Driver
Copyright : Copyright (c) MCCI 1997-2005
Product Version : V4.34
Product Name : Sony Ericsson W550 USB WMC Modem
Company Name : MCCI
Internal Name : w550mdm.sys
File Size: 96672 byte(s) 94.416 KB
MD5 : 73e2933110d3cf48eabc6265924d1b5f
SHA1: 7451B73EAB3CE245854D6A7D7775089BAB3C0815

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