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File version : V4.16
Description : CP2101 USB to UART Bridge Controller WDM
Copyright : Copyright (c) MCCI 1997-2003
Product Version : V4.16
Product Name : CP2101 USB to UART Bridge Controller
Company Name : MCCI
Internal name : cyg_ser.sys
File Size: 82704 byte(s) 80.784 KB
MD5 : 71f31840b56a6ddb4508c3448e7f9dc7
SHA1: B32C95A3AB1043AC097FFBFF1299450C97F1B86E

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