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File Version : 5.1.2600.1106 built by: WinDDK
Description : OSA I/O Port Driver
Copyright : Copyright (c) 2001-2006 OSA Technologies. All Rights Reserved.
Product Version : 5.1.2600.1106
Product Name : Windows (R) 2000 DDK driver
Company Name : OSA Technologies, An Avocent Company
Internal Name : osaio.sys
File Size: 6784 byte(s) 6.640 KB
MD5 : 1204a181aae8d17be8786ef8fb70a1c6
SHA1: 0076623B95E0E41C9FFC608242D06781547A0600

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