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Sample NDIS 4.0 Intermediate Miniport Driver
Windows (R) 2000 DDK driver
Windows (R) 2000 DDK provider

Download xAntiArp.sys
Click here to run a free scan for xAntiArp.sys related errors

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