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File version : V4.16
Description : Cygnal USB Composite Device Driver
Copyright : Copyright (c) MCCI 1997-2003
Product Version : V4.16
Product Name : Cygnal USB Composite Device
Company Name : MCCI
Internal name : cyg_bus.sys
File Size: 51040 byte(s) 49.864 KB
MD5 : 9b3340e5b94690f8e9509610b2abc371
SHA1: FC7E89AA798A7D008F56D020AF419487E0B92391

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