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File version :
Description : WCDMA USB Modem Driver
Copyright : (C) 2003 NEC Corporation
Product Version : 1.00
Product Name : WCDMA USB Driver for Windows2000/XP
Company Name : NEC Corporation
Internal name : atusbm.sys
File Size: 36352 byte(s) 35.512 KB
MD5 : 084a71a49a4e2a45ca437e30346b7512
SHA1: 008F114999C6D61E7FBA5A7B6E898253A6EE5278

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