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File Version : V4.28
Description : Sony Ericsson Z800 USB WMC Modem WDM Driver
Copyright : Copyright (c) MCCI 1997-2005
Product Version : V4.28
Product Name : Sony Ericsson Z800 USB WMC Modem
Company Name : MCCI
Internal Name : z800mdm.sys
File Size: 89872 byte(s) 87.784 KB
MD5 : 368e4bf66728848f66602f4cb95dc788
SHA1: A098EB807B1283E0990A7ED16A3D3B05A7EAA559

Download Z550cmnt.sys
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How to Install Z550cmnt.sys
Repair Sys ProblemsFixing a corrupted or missing Z550cmnt.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.