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File Version : built by: WinDDK
Description : NT 5 (NDIS 5.1/5.0) x86 Driver
Copyright : 2003-2004, Inprocomm, Inc. All Rights Reserved.
Product Version :
Product Name : INPROCOMM IPN2220 Wireless LAN Adapter Driver
Company Name : Inprocomm, Inc.
Internal Name : i2220ntx.sys
File Size: 159872 byte(s) 156.128 KB
MD5 : c6a0445c5ad87b542e31eab30cdd5bb6
SHA1: 69A305AAAC8B1ACABDB4388221947E1444C900BD

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