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File Version : 3.51
Description : 3Com Specialized Diagnostic Driver
Copyright : Copyright Microsoft Corp. 1981-1995
Product Version : 3.51
Product Name : Microsoft Windows NT(TM) Operating System
Company Name : Microsoft Corporation
Internal Name : pcomdrv.sys
File Size: 9152 byte(s) 8.960 KB
MD5 : 6669fae819b877ede640f1e09f938102
SHA1: 4672336459AFAC1FB014B58289EA1C7BC89FBA51

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