What is mresp50?

Mresp50.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 mresp50.sys is a Windows system file or if it belongs to an application that you can trust.

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Mresp50.sys file information

The process known as PCAUSA NDIS (version 5.0 SPR Protocol Driver) or MRESP50 NDIS Protocol Driver belongs to software MRESP50 NDIS Protocol Driver or BT Wireless Connection Manager or Trusteer Endpoint Protection by Printing Communications Assoc., Inc. (PCAUSA) (

Description: Mresp50.sys is not essential for the Windows OS and causes relatively few problems. Mresp50.sys is located in a subfolder of "C:\Program Files\Common Files". Known file sizes on Windows 10/8/7/XP are 20,096 bytes (70% of all occurrences) or 18,304 bytes. 
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 mresp50.sys file is not a Windows system file. mresp50.sys appears to be a compressed file. Therefore the technical security rating is 33% dangerous.

Uninstalling this variant: If you encounter difficulties with mresp50.sys, you can also safely remove the program using the uninstall program of BT Wireless Connection Manager or Trusteer Endpoint Protection (Control Panel ⇒ Uninstall a Program).

Recommended: Identify mresp50.sys related errors

Important: Some malware camouflages itself as mresp50.sys. Therefore, you should check the mresp50.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.


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Best practices for resolving mresp50 issues

A clean and tidy computer is the key requirement for avoiding problems with mresp50. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the mresp50.sys process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

mresp50.sys [all]