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File Version : 4. 11. 21
Description : 1807 hardware driver
Copyright : Copyright (C) 2000 U.S. Robotics Corporation
Product Version : 4. 11. 21
Product Name : U.S. Robotics Modem Driver
Company Name : U.S. Robotics Corporation
Internal Name : 3c1807.sys
File Size: 224802 byte(s) 219.546 KB
MD5 : c4b1fbee0d0ed69e246e2d6bb8f2d813
SHA1: 2D0E411ABEC81DD4B215C68AB66768E7E3E1B1F0

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