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File Version : V4.34
Description : Sony Ericsson Z530 USB WMC Modem WDM Driver
Copyright : Copyright (c) MCCI 1997-2005
Product Version : V4.34
Product Name : Sony Ericsson Z530 USB WMC Data Modem
Company Name : MCCI
Internal Name : z530mdm.sys
File Size: 94064 byte(s) 91.880 KB
MD5 : 93f8168e22f1b428c5b330d8b814eaf5
SHA1: E53585D85525A8F79FF29389CFEF4BDD9C0D8009

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How to Install yk51x64.sys
Repair Sys ProblemsFixing a corrupted or missing yk51x64.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.