What is ser2pl?

Ser2pl.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if ser2pl.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for ser2pl drivers in need of updating

Ser2pl.sys file information

The process known as USB-to-Serial Cable Driver belongs to software Prolific USB-to-Serial Bridge Cable or GPS Locator Serial port driver (version 911024) by Prolific Technology (

Description: Ser2pl.sys is not essential for the Windows OS and causes relatively few problems. Ser2pl.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 48,640 bytes (16% of all occurrences), 43,264 bytes and 4 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The service has no detailed description. The ser2pl.sys file is not a Windows core file. ser2pl.sys appears to be a compressed file. Therefore the technical security rating is 30% dangerous, however you should also read the user reviews.

Recommended: Identify ser2pl.sys related errors

Important: Some malware disguises itself as ser2pl.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the ser2pl.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Serial to Parallel Driver
  Justin Fuller  
Is driver for Prolific USB to serial (com port) data cable
Cable Driver for nokia 6030 data cable
Flagged as missing when installing Globalsat ND-100s USB GPS module.
  Nik (UK)   (further information) (further information)

Rating chart

Summary: Average user rating of ser2pl.sys: based on 19 votes with 4 user comments. 16 users think ser2pl.sys is essential for Windows or an installed application. 2 users think it's probably harmless. One user thinks it's neither essential nor dangerous.

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Best practices for resolving ser2pl issues

A clean and tidy computer is the key requirement for avoiding problems with ser2pl. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the ser2pl.sys process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

ser2pl.sys [all]