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File Version : 4.90.3000
Description : IOS to WDM I/O mapper
Copyright : Copyright Microsoft Corp. 1981-2000
Product Version : 4.90.3000
Product Name : Microsoft(R) Windows(R) Millennium Operating System
Company Name : Microsoft Corporation
Internal Name : USBNTMAP.SYS
File Size: 7136 byte(s) 6.992 KB
MD5 : fe5d07e415200f7c39ed4731628f38a2
SHA1: 0F99961FF3901E800205766FB84A7EE96D7B9202

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