What is PCASp50?

The genuine PCASp50.sys file is a software component of PCAUSA Rawether for Windows by Printing Communications Assoc., Inc. (PCAUSA).
Rawether for Windows is a 5th generation framework for development of Windows products to allow a user-mode application to "directly" access NDIS network interface card (NIC) drivers from Win32 applications. Rawether uses NDIS protocol drivers that act as a "relay" between an application and the NDIS miniport driver. Using Rawether for Windows applications can send and receive raw Ethernet packets on a selected miniport.

PCASP50 stands for Printing Communications Association SPR Protocol Driver 50

PCASp50.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 PCASp50.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for PCASp50 drivers in need of updating

PCASp50.sys file information

The process known as PCAUSA NDIS (version 5.0 SPR Protocol Driver) or PCASp50 NDIS Protocol Driver belongs to software PCAUSA Rawether for Windows or PCASp50 NDIS Protocol Driver by Printing Communications Assoc., Inc. (PCAUSA) (

Description: PCASp50.sys is not essential for the Windows OS and causes relatively few problems. The PCASp50.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 27,072 bytes (50% of all occurrences), 20,096 bytes or 18,560 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. The service has no detailed description. PCASp50.sys is not a Windows system file. The application can be removed using the Control Panel's Add\Remove programs applet. PCASp50.sys appears to be a compressed file. Therefore the technical security rating is 17% dangerous, however you should also read the user reviews.

Uninstalling this variant: If there are any problems with PCASp50.sys, you can uninstall Linksys WUSB600N Dual-Band or Linksys WUSB100 RangePlus from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify PCASp50.sys related errors

Important: Some malware disguises itself as PCASp50.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the PCASp50.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

The file is a Network file require for the DHCP service. Developed by Printing Communications Assoc., Inc. (PCAUSA)
  John   (further information)

Summary: Average user rating of PCASp50.sys: based on 1 vote with 1 user comment. One user thinks it's probably harmless.

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Best practices for resolving PCASp50 issues

A clean and tidy computer is the key requirement for avoiding problems with PCASp50. 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 PCASp50.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

PCASp50.sys [all]