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File version : V4.16
Description : Windows 2000/XP support functions
Copyright : Copyright (c) MCCI 1997-2003
Product Version : V4.16
Product Name : CP2101 USB to UART Bridge Controller
Company Name : MCCI
Internal name : cyg_cm.sys
File Size: 6112 byte(s) 5.992 KB
MD5 : 12a3ac59654dac5914f01aa3e1a8276f
SHA1: 61A149226721C1D70E3FFA61C284650B5651F553

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