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File Version : built by: WinDDK
Description : PenTablet Bus enumerator
Copyright : Copyright (C) 2002-2006
Product Version :
Product Name : PenTablet Bus enumerator
Company Name : PenTablet Driver
Internal Name : PTSimBus.sys
File Size: 18944 byte(s) 18.512 KB
MD5 : 688983e03c0d82b2efa1db89792c4c6c
SHA1: 708A87F49164EE21CE6D90DB2A960443EF6F433C

Download USR7900.SYS
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How to Install USR7900.SYS
Repair Sys ProblemsFixing a corrupted or missing USR7900.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.