What is MCSTRM?

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

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

MCSTRM.sys file information

The process known as RealNetworks Virtual Path Manager belongs to software RealNetworks Virtual Path Manager (version (32-bit)) by RealNetworks (

Description: MCSTRM.sys is not essential for Windows and will often cause problems. The MCSTRM.sys file is located in the C:\Windows\System32\drivers folder. The file size on Windows 10/8/7/XP is 8,413 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. There is no detailed description of this service. The MCSTRM.sys file is not a Windows system file. MCSTRM.sys appears to be a compressed file. Therefore the technical security rating is 40% dangerous, but you should also take into account the user reviews.

Recommended: Identify MCSTRM.sys related errors

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

from what I can tell on my system it in the past week has deleted about half of my burn rights 1500 out of over 3000 tracks. then deleted itself vis one of Rhapsodys txt files.
A part of the Rhapsody Music Service client
DRM magement tool for the Rhapsody desktop client.It also seems to be needed to log into the client.I had deleted it,since it was "file not found" in an a Microsoft program I have (aotoruns).I then found myself unable to log in to the client.after a re-install a window advised me that a DRm component needed to be re-installed in order to play back unpurchased tracks.I assume streaming was meant,as the client downloads tracks to your temp file for playback at better bit rates.After doing this,I found MCSTRM had been reinstalled.This is all I know of this program.

Summary: Average user rating of MCSTRM.sys: based on 3 votes with 3 user comments. One user thinks MCSTRM.sys is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks MCSTRM.sys is dangerous and recommends removing it.

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Best practices for resolving MCSTRM issues

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

MCSTRM.sys [all]