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File version : 6.1.7600.16385 built by: WinDDK
Description : Explore Systems Virtual Audio Device
Copyright : Copyright (C) Explore Systems Inc.2012
Product Version : 6.1.7600.16385
Product Name : Windows (R) Win 7 DDK driver
Company Name : Windows (R) Win 7 DDK provider
Internal name : dfx.sys
File Size: 24424 byte(s) 23.872 KB
MD5 : 30384865c9af82db291e5c4f468e1ac6
SHA1: 4B2A621DCC6E305E095A01853EFA5ADDA692766F

Download dfx11_1.sys
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How to Install dfx11_1.sys
Repair Sys ProblemsFixing a corrupted or missing dfx11_1.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.