What is oz776?

The genuine oz776.sys file is a software component of Smart Card Reader by O2Micro.
The file is part of the driver for a Smart Card Reader (SCR) and CardBus controller. The development by O2Micro has lowered costs of ownership of e-commerce and corporate security Smart Card applications. SmartCardBus products are compliant with Microsoft PC/SC, ISO 7816-1, -2, -3 electrical specifications, standard protocols including T = 0, T = 1, and are EMV Level 1 certified. EMV certification is a requirement for SCRs for use with new financial smart cards issued by American Express, Visa and Citibank.(MasterCard). Founded in April 1995, O2Micro International limited (NASDAQ: OIIM) designs, develops and markets innovative power management components for the Computer, Consumer, Industrial, Automotive and Communications markets

OZ776 stands for OZ776 SCR Driver

Oz776.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 oz776.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for oz776 drivers in need of updating

Oz776.sys file information

The process known as O2Micro USB CCID SmartCard Reader or guardian2 belongs to software guardian2 or O2Micro USB Smart Card Reader or OZ776 SCR Driver by O2Micro (

Description: Oz776.sys is not essential for Windows and will often cause problems. Oz776.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 56,320 bytes (37% of all occurrences), 62,208 bytes, 68,696 bytes or 60,544 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The file is a trustworthy file from Microsoft. There is no detailed description of this service. Oz776.sys is not a Windows system file. oz776.sys appears to be a compressed file. Therefore the technical security rating is 8% dangerous; however you should also read the user reviews.

Uninstalling this variant: There is a possibility to completely remove OZ776 SCR Driver or O2Micro USB Smart Card Reader (Control Panel ⇒ Uninstall a Program).

Recommended: Identify oz776.sys related errors

Important: Some malware disguises itself as oz776.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the oz776.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

It was installed as part of Blackeberry manager. On my Dell Latitude compurter and one other Dell Latitude is is causing a blue screen error. I feel it is specific to the Dell Latitude. Not malicious.
  ASC963741   (further information)

Summary: Average user rating of oz776.sys: based on 3 votes with 1 user comment. One user thinks it's probably harmless. 2 users think it's neither essential nor dangerous.

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Best practices for resolving oz776 issues

A clean and tidy computer is the key requirement for avoiding problems with oz776. 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 oz776.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

oz776.sys [all]