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File Version : 5.1.2600.5512 (xpsp.080413-2108)
Description : Update Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 5.1.2600.5512
Product Name : Microsoft Windows Operating System
Company Name : Microsoft Corporation
Internal Name : update.sys
File Size: 384768 byte(s) 375.768 KB
MD5 : 402ddc88356b1bac0ee3dd1580c76a31
SHA1: 3068CF03D3BFF84FB1144E4E03A1242F0261A374

Download U81xbus.sys
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How to Install U81xbus.sys
Repair Sys ProblemsFixing a corrupted or missing U81xbus.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.