What is mouclass?

The genuine mouclass.sys file is a software component of Microsoft Windows Operating System by Microsoft Corporation.
"Mouclass.sys", located in "C:\Windows\System32\drivers", is the Microsoft Windows Mouse Class Driver for non-HID mice, generally meaning PS/2 (non-USB) mice because the Human Interface Device standard is part of the USB standard. Windows has used the Class Driver approach for non-HID mice since Windows 2000. "Mouclass.sys" can handle multiple mouse devices on the same computer, either in "one-on-one" mode where each device has its own stack, or in "grandmaster mode" where the driver creates a single "grandmaster" filter device object (DO) and a subordinate DO for each device. If the registry key "HKLM\Services\CurrentControlSet\mouclass\Parameters" is "0x00", it uses the latter.

MouClass stands for Mouse Class Driver

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

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

Mouclass.sys file information

The process known as Mouse Class Driver belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).

Description: Mouclass.sys is an important part of Windows, but often causes problems. Mouclass.sys is located in an undetermined folder.
The driver can be started or stopped from Services in the Control Panel or by other programs. The service has no detailed description. The program has no visible window. The mouclass.sys file is digitally signed. Mouclass.sys is a Microsoft signed file. It is not a Windows system file. mouclass.sys appears to be a compressed file. Therefore the technical security rating is 11% dangerous; but you should also compare this rating with the user reviews.

Uninstalling this variant: If you encounter difficulties with mouclass.sys, you can uninstall Microsoft Windows software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7) or ask for help from Support.

Recommended: Identify mouclass.sys related errors

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

Score

User Comments

Mine became infected, but once cleaned worked perfectly for mouse function
jamie

mouclass.sys is a virus particuarly a stealth trojan that operates in your operating system ROOTKIT use combofix to fix it
Windows Defender

My AVG virus scan shows it to be a virus but does not heal it
Alan

mouclass.sys is the system IRP (I/O request packet) for the mouse class driver. It is the "on/off" switch in boot up for your mouse. Meaning if you delete this.sys on your computer your mouse will have trouble working. There are viruses built to attack this file in the registry, however the file itself is not a virus.
myself

I got error "File mouclass.sys is corrupt or unreadable" but was able to fix it running XP Repair Install - and checking my drive integrity.
Heidi

Not to much I ran the DLL File Finder think it said I was missing this file
phillip hower jr

Summary: Average user rating of mouclass.sys: based on 9 votes with 6 user comments. 2 users think mouclass.sys is essential for Windows or an installed application. 3 users think it's probably harmless. 3 users suspect danger. One user thinks mouclass.sys is dangerous and recommends removing it. One user is not sure about it.

Best practices for resolving mouclass issues

A clean and tidy computer is the key requirement for avoiding problems with mouclass. 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 executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To get your computer running as fast as it did on day one, you can 8reset your PC. Your personal files will remain intact, but any programs you installed will need to be reinstalled.

To help you analyze the mouclass.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. A good Bantivirus software detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

ups-service.exe a2start.exe gridwndhooklm32.dll mouclass.sys screenwings.exe mobilehotspotclient.exe fshdll64.exe tib.sys bka.exe hpadvisor.exe com.geocomply.process-scanner-microservice.exe [all]

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