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File Version : 5.1.2600.0 (XPClient.010817-1148)
Description : MPU401 Adapter Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 5.1.2600.0
Product Name : Microsoft Windows Operating System
Company Name : Microsoft Corporation
Internal Name : msmpu401.sys
File Size: 2944 byte(s) 2.896 KB
MD5 : ca3e22598f411199adc2dfee76cd0ae0
SHA1: FA3C20A29181F348AB934FC4C4A456449D5A5AFF

Download MRV8335NT.sys
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How to Install MRV8335NT.sys
Repair Sys ProblemsFixing a corrupted or missing MRV8335NT.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.