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USB Mass Storage Class Driver

The file USBSTOR.SYS is used to execute service USB Mass Storage Class Driver for win32k.sys and tcpip.sys, and support device drivers in computer OQO.

The driver USBSTOR.SYS was published at 7/13/2009 5:06:35 PM, and is usually located in C:\Windows\System32\drivers\USBSTOR.SYS. Once active, driver will occupy 89600 KB of memory usage.

If the memory usage of USBSTOR.SYS showed in Task Manager is over 4689172 bytes, then there is a virus PWS:Win32/Coced.236.A or Trojan Program:Win32/AdsAlert on your machine. This file should be replaced immediately with a clean one.

Download clean USBSTOR.SYS for free with DLL Tool

Note: PWS:Win32/Coced.236.A is developed by the author of website http://www.rmbsoft.com/si/ and spreads through installing malware System Inspector.

The USBSTOR.SYS driver with version 6.1.7600.16385 is shared by game Portal 2, web browser RockMelt and antivirus Immunet Plus.

If the version number changes and USBSTOR.SYS is not restored ASAP, your computer would receive msvcrt.dll missing error, not digitally signed and error code 0x097E(The specified client is already registered for the specified event.).

USBSTOR.SYS vulnerability leads to a total of 468917289600 hits by Program:Win32/AdsAlert since 7/13/2009 5:06:35 PM in Turkey, R'union, Sri Lanka, Moldova and Afghanistan, said James Valley, a website editor in Faceparty.

How to fix USBSTOR.SYS errors?

To fix and repair USBSTOR.SYS problems, please download DLL Tool.

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How to avoid USBSTOR.SYS issues?

The cause of USBSTOR.SYS not digitally signed by Microsoft (MS) is the driver has become outdated, the registration information has been changed by virus / spyware, or has been removed by antivirus.

When the USBSTOR.SYS is missing, your external harddisk (USB) will not open. If it is not fixed immediately, your computer will have USBSTOR.SYS BSOD errors soon.

To fix this error, what you need to do is to restore the lost USBSTOR.SYS. You can get the file from your system setup disk or retrieve one from the DLL file free download services provided by DLL Tool.

The next focus on this page is to prevent this error in the future, here we will tell you how-tos.

Registry Defragmentation will tune up your Windows registry and make it slim. It is an important system maintenance method to keep your Windows problems away.

Registry Clean helps clean up invalid registry entries created by software installing and uninstalling. A clean registry always means an error-free Windows.

DLL File Fix will repair all error in DLLs. DLL error is the cause of all Windows problems. So fixing DLL problem is an effective way to prevent your PC errors.

To achieve the above goals, you can download DLL Tool and use it.

FAQs of USBSTOR.SYS on Microsoft Answers

  1. Robert Bohen - USBStor.sys aren't digitally signed by MS, it says the version ID is wrong, how to restore it to original version 6.1.7600.16385 in my windows 7.
  2. Nicholas BC Ng - USB of my Blackberry SmartPhone cannot load due to outdated driver USBStor.sys. I didn't update this device, please tell me how to fix it, thanks.
  3. Oliver Wilhelm - %systemroot%\ServicePackFiles\i386\usbstor.inf is turned off in my windows xp and vista, and now i can't use any USD device. Please tell me how to go through this problem.
  4. nita hope - MY Cp Wont Recognize My External Hard Drive in my windows 8 pro 64 bits. This prevents me from accessing the images and other files on my phone.
  5. Ch. Bart - Windows 7 can't open external hard drive when the USBSTOR.SYS is deleted by my antivirus kaspersky. How to restore it to my PC.

For more USBSTOR.SYS FAQs, please visit http://answers.microsoft.com/en-us/Search/Search?SearchTerm=USBSTOR.SYS&askingquestion=False&page=1

8.13 MB - Windows 8/7/Vista/XP, 32- & 64-bit

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