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File version : 1.0.503.26149
Description : Hauppauge WinTV HVR-900H-Stick
Copyright : Copyright Hauppauge Computer Works, Inc. 2007
Product Version : 1.0.503.26149
Product Name : Hauppauge WinTV HVR-900-Stick
Company Name : Hauppauge Computer Works, Inc.
Internal name : hcw66x64.sys
File Size: 478720 byte(s) 467.512 KB
MD5 : 22da55958ea61f86106584b33b2d9803
SHA1: 325B64DBF6466958815088488C6267303C961066

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How to Install hcw66x64.sys
Repair Sys ProblemsFixing a corrupted or missing hcw66x64.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.