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File Version : 1.08.0120.0 Release built by: WinDDK
Description : Cypress Generic USB Device Driver
Copyright : Copyright(C) Cypress Semiconductor 2005-2006
Product Version : 1.08.0120.0 Release
Product Name : Cypress Generic USB Device Driver
Company Name : Cypress Semiconductor
Internal Name : CyUsb.sys
File Size: 34304 byte(s) 33.512 KB
MD5 : ffd072e73c62d2731ab89e695dced22e
SHA1: ECDBD306F91525A6FFC3C9E676A852E48183FF86

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