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File Version : 5.1.2600.0 (XPClient.010817-1148)
Description : ALi Fast Infrared Device Driver
Copyright : Copyright (C) 2000 Acer Laboratories Inc.
Product Version : 5.1.2600.0
Product Name : ALi Fast Infrared Device Driver
Company Name : Acer Laboratories Inc.
Internal Name : ALiIRDA.SYS
File Size: 26624 byte(s) 26.0 KB
MD5 : d81f7d885e9393b09ec5e46ed8d91565
SHA1: FAC0E098F027E01FC29523744A942F22D45A824E

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