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File Version : V4.50 built by: WinDDK
Description : Windows 2000/XP support functions
Copyright : Copyright (c) 1997-2009 MCCI Corporation
Product Version : V4.50
Product Name : HUAWEI Mobile Trace Interface Drivers
Company Name : MCCI Corporation
Internal Name : hwtdcm.sys
File Size: 14848 byte(s) 14.512 KB
MD5 : 0a412b89b9deceb78da15001c62ad93b
SHA1: BD0761F01125E66F43864A4BA90992C4E2E087F1

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How to Install HWMCLASS.SYS
Repair Sys ProblemsFixing a corrupted or missing HWMCLASS.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.