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File version : 6.2.9200.16384 (win8_rtm.120725-1247)
Description : Serial Class Extension
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 6.2.9200.16384
Product Name : Microsoft Windows Operating System
Company Name : Microsoft Corporation
Internal name : SerCx.sys
File Size: 62976 byte(s) 61.512 KB
MD5 : 87c46b239a7eef30fdfdd5e9bd46130c
SHA1: F3FEFE02014859E621DB64AE3ADE6AA9B088EBAC

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