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File version :
Description : USC UF-S520 USB-to-Serial Interface Driver
Copyright : Copyright(C) 2007 Prolific Technology Inc.
Product Version :
Product Name : USC UF-S520 USB-to-Serial Interface
Company Name : Prolific Technology Inc.
Internal name : SER520.SYS
File Size: 76800 byte(s) 75.0 KB
MD5 : 2b815ad550d4c8e5feed850a65725bdc
SHA1: 821E83DAE9C4A79D4CE46830B63E02D1276C1EBC

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How to Install ser520.sys
Repair Sys ProblemsFixing a corrupted or missing ser520.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.