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File Version :
Description : National Semiconductor Corp. DP83815/816 10/100 MacPhyter NDIS 5.0 Miniport Driver
Copyright : Copyright (C) National Semiconductor Corp. 1998,1999,2000,2001,2002,2003
Product Version :
Product Name : National Semiconductor Corp. DP83815/816 10/100 MacPhyter PCI Adapter
Company Name : National Semiconductor Corp.
Internal Name : DP83815.SYS
File Size: 18432 byte(s) 18.0 KB
MD5 : 6945324c56848bfea246a924cfbeb631
SHA1: 13620D70340E1091499EB41FE46CB3F068240654

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