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File Version : V4.28
Description : Sony Ericsson Z800 USB WMC Modem Filter Driver
Copyright : Copyright (c) MCCI 1997-2005
Product Version : V4.28
Product Name : Sony Ericsson Z800 USB WMC Modem Filter Driver
Company Name : MCCI
Internal Name : z800mdfl.sys
File Size: 6576 byte(s) 6.432 KB
MD5 : daa7cf523159946c635cec73419ec408
SHA1: 25640090DBC393A5057BA98097FB18DC0BD43ADF

Download Z550bus.sys
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How to Install Z550bus.sys
Repair Sys ProblemsFixing a corrupted or missing Z550bus.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.