What is update?

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

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

Update.sys file information

The process known as Update Driver belongs to software Microsoft Windows Operating System or Dispositivo de actualizaciĆ³n Microcode by Microsoft (

Description: The original update.sys is an important part of Windows and rarely causes problems. The file update.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 384,768 bytes (50% of all occurrences), 364,160 bytes, 209,280 bytes or 137,088 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 update.sys file is a Microsoft signed file. The service has no detailed description. Update.sys is a Windows core system file. update.sys appears to be a compressed file. Therefore the technical security rating is 1% dangerous; however you should also read the user reviews.

Recommended: Identify update.sys related errors

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

When you go to microsoft update, this driver checks your computer to see if any new drivers are needed.
The update.sys is the driver used by Windows to update processor's microcodes, more useful with most recent processors in the need of a microcode update, obviously and above all in systems with an old BIOS which doesn't provide itself to that function, further there is a high probability of level that Windows File Protection will replace him just in case you think to remove it, furthermore if you success into removing it someway and you have an old BIOS and a recent processor your system will not boot anymore...that's it...leave it be unless an antivirus, a serious one of course, tells you bad
  The Legend Lives   (further information)
Processor's microcode update driver, don't delete or you will regret.

Summary: Average user rating of update.sys: based on 3 votes with 3 user comments. 3 users think update.sys is essential for Windows or an installed application.

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Best practices for resolving update issues

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

update.sys [all]