Fix system Error 21 and Runtime Error 21

System Error 21 and Runtime Error 21 Description

System Error 21 Definition: The device is not ready.

System error 21, also known as ERROR_NOT_READY (0x15), can be generated when one of the following incidents listed below occur. but, in general, system Error 21 is caused due to conflicts in the operating system (Windows), USB drivers aren't installed correctly, system update is needed, Windows setting are not optimized correctly.

Device Manager Error 21 Definition: Windows is removing this device.

The Device Manager in Windows XP (and in Windows Vista and Windows 7 as well) is responsible for all devices connected to your computer. This Error can occur when the device (USB, External hard drive, ext.) you inserted has not yet been completely removed. Sometimes when Windows processes the removal of the device it takes a very long time and the process is even get stuck. This error means that Windows is in the process of removing the device but due to junk in your device, junk in your hard drive and system settings that need optimization, the process can get lost on the way or it just take a lot of time to execute it. Running this tool will clean junk from your computer and will prevent Error 21 in Device Manager to occur. (For more details see Device Manager Error 21 causes below.)

Runtime Error 21 Definition: explorer.exe is locked

Windows explore.exe is essential for Windows to implement proper and healthy operations, and for running applications. This error has several optional causes (see Runtime Error 21 causes below).
Fix this problem now by downloading this specially designed repair tool.

GRUB Error 21 Definition: The boot loader fails when installing Ubuntu from Windows operation system.

You might encounter Error 21 when you tried to install Ubuntu from Windows or boot Windows after installing Ubunto and the following message appeared: GRUB loading Stage 1.5
Grub loading, please wait....
Error 21.
This error may occur because you are trying to boot into windows without the external/original drive attached. System optimization might resolve this problem. Try this tool to optimize your system settings and prevents systems conflicts.

This web site provides you the perfect tool to deal with error 21 and its variations, it will optimize your system, clean any junk and allow your operating system to "breath".

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Error 21 Causes

System Error 21 Causes:

The following incidents can cause System Error 21:

While trying to map DFS using net command or access a DFS from My Network Places
You may receive an Error 21 message: "Device Is Not Ready" when Creating a Server Cluster MSMQ Resource
The drive is empty. The drive door is open. The drive is in use.
If you are trying to list the contents of a floppy disk after you resume the computer from standby.
A Bluetooth Device may not be detected after you have tried to install it.
Plugged in Removable Media Devices (USB, external hard drives, MP3 Players) with damaged devices driver or damage external port driver (USB, eSATA, FireWire).
One of the symptoms is that you cannot restart Windows or shut it down with the shutdown command.
Msvcp60.dll file, returns Error 21 in Windows file protection when upgrading a Windows based systems from one version to another (ex. upgrading from Windows XP to Windows 7).
Trying to uninstall Microsoft Antigen for Exchange from a cluster can cause Error 21: "Device is not ready".

In general, System Error 21 occurs when there is a conflict within system files and/or DLL files. To prevent Error 21 we offer you this tool that will optimize your system settings, will reorganize your system files and will take care of Windows Registry, and by doing so, it will solve system conflicts.

Device Manager Error 21 Causes:

When you are receiving an Error 21 message you should ask yourself "why is that?" Well, the cause of Error 21 in the Device Manager is most probably bad system configurations and junk. every action the Windows does it has to go through a bunch of data to execute it, if these bunch of data is disorganized and full of unnecessary files, the process will take longer than it should and might even get stuck.
We provide you the perfect tool to optimize your system and deal with error 21 by cleaning your computer from all these unnecessary junk that is on your system, registry, hard drive, and external devices.

Runtime Error 21 Causes:

Every time you start your computer you get one or even several error 21 messages. This could be very annoying since you don't know the cause and the system does't provide any explanations. So, here are the main causes for Runtime Error 21:

Software issue - The runtime Error 21 can be caused by a game, software, or a new plug-ins or add-ons that are associated with the program that is generating runtime Error 21, or any runtime Error.
A Computer Virus - computer viruses can exploit the system memory and mess with system settings and system files, they are likely to cause this error.
Memory related issue - damaged memory sticks, damaged memory blocks, and space allocation issue can cause this error as well.
TSR or other running program conflicts - many programs that consume lots of system resources can cause runtime Error 21 to occur.

All this symptoms suggest that system settings and/or system files are defected and a major optimization is needed. Run this tool to optimize your system and improve every parameter and as a result, prevent and solve runtime Error 21.

GRUB Error 21 Causes:

Tried to install Ubunto from Windows based system and failed? Tried to boot into Windows when you have Ubunto installed on another drive and did not succeed? This error can be caused due to system setting conflict and perhaps BIOS related configurations.

We provide you the perfect tool to solve Error 21 and optimize your system settings. All you have to do is to follow these 3 simple steps:


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Error 21

System Error 21 and Runtime Error 21 Description

Error 21 Causes

Fix Error 21

Error 21 Repair Tool