What to do with c000021a blue screen errors

1. There are trojans or viruses in the computer, download the "360 Security guards" and "360 antivirus dual engine version", the proposed "comprehensive scan" virus and Trojan, repair the loopholes on the computer!

2. You download the "player", or "chat software", or "driver", or "IE browser" of the program is not stable, or "version is too old"! It is recommended to unload, download new, or upgrade it to the latest version.

3. Is you installed two or more than two of similar software (such as: Two player, two QQ, or a variety of browsers, a variety of anti-virus software and so on)! They are not "compatible" together, remove the "superfluous" one!

4. In the lower left corner of the computer, you find the "strong uninstall software on the computer" in the "Start" menu and find the extra one to unload! After unloading the "strong sweep" (see the unloading, do not take the useful unloading).

5. The computer boot time is too long, CPU memory overheating, heat dissipation is bad, graphics cards and memory plugging, it is recommended to unplug with rubber or dry paper (cloth) Wipe!

6. Reboot the computer, press "F8" after the boot, enter "Safe mode", find "the last correct setting", press down, try!

7. Download "360 First aid box" formerly known as: "360 stubborn Trojan Kill Daquan", began the "First aid system"!

8. It is not possible to "restore the system" or "Reload the system"!

9. If the "Win7 system" or "Vista system" play the game when the "blue screen", is the game and memory conflict, not supported, the proposed replacement "game version", or "Uninstall game" or "replacement system", symptoms can disappear!

10. If this is "accidental" or "power-on and shutdown" Blue 屛, it is likely that "software" needs to "upgrade" (Note: "360 security Defender 6.2 version" can not be promoted, "WinRAR" can not be promoted!) or "system poisoning" caused!

11. Reload the system and restore the system, the computer "continue" blue screen, the reason is: Restore and reload after the computer software is "old", or the process is not stable! Or the system does not support, so will be blue screen error! So, "restore the system and reload the system", the software and drivers must be "update Upgrade"!

12. Software and hardware are likely to appear "blue screen", the proposed "exclusion method", one after the attempt to exclude the possibility, and finally "summed up" the reason!

The problem of stop:c000021a unknown hard error

1 installed when the stop:c000021a unknown hard error

A few days ago I format the assembly is not on the machine, I first in the pure DOS to exclude viruses and software conflicts, hard disk track check also nothing can still not installed

Later found that the installation of CD-ROM damage caused some incomplete installation files caused by the replacement of new system disk problem solved.

2. Unknown track error or unknown hardware error

This problem occurs first track check first we confirm the hard drive of the bad way is the logical bad way or physical bad, the method is very simple. In the computer just started, press the "F8" button, select "C ommand Prompt only" into the DOS mode (the operating system must be win95/98, if for win2000/xp please use the DOS boot disk), the implementation of "Scand ISK x:" (X for the letter), The ScanDisk program will check the hard drive, the resulting logical bad way will pop-up dialog box, select "Fix It" to the logical bad road for primary repair. If the scanner is stalled at a certain pace, then the hard drive has a physical bad way.

For a hard drive that has been initially repaired with a logical bad path, after normal boot back to Windows, into the "My Computer" to select a logical bad hard drive, click the right mouse button, select the "properties" → tools → "Start check" pop-up "ScanDisk", select "Full" and "Automatically Fix Errors" Tick click Start to scan and repair the partition.

And for the hard drive with the physical bad, the above method is powerless, but it is not no way.

I would like to introduce a "PartitionMagic" (Division Magician, hereinafter referred to as PM) to repair the hard disk method.

By repartition the hard disk, hide the hard disk space with the physical bad path, and isolate it. The concrete practice is: Start PM First, select "Check" command under "Operations" menu, direct scan to hard disk, Mark bad cluster, check "Advanced" under "Operations" menu "→" Wicked sector Retset finally divides the bad cluster into a separate partition, and then hides the partition by the "Hide Partiton" command.

Track damage appears stop:c000021a unknown hard error 0 track more generally this situation, most people will be hard to scrap processing. But it is not absolutely impossible to repair, the principle is very simple, as long as 1 sectors to replace 0 sectors on the line

This time please "Diskman" to help us, it is a more commonly used hard disk tools, we can download in the Chinese military Software Park (BJ.ONLINEDOWN.N ET). After downloading in pure dos run, in the "Hard drive" menu to modify the disk (generally for C disk), and then enter the "tool" → "parameter modification" → "Start cylinder" value from "0" to "1", determined to save exit. You can repartition the hard disk.

If the above method does not work after the problem, then the ultimate Dafa is used--low-level format

Check each hardware installation is not a problem, has not modified the parameters:

Two. Computer switch machine appears

stop;c000021a Unknown hard error (software conflict)

I found that my Windows XP can not shut down, also can not reboot, because my XP disabled "if there is a serious error automatically restart", so each time only appear blue screen, prompted to say "Stop c000021a unknown hard error unknown hard Error ", preliminary understanding, is not aware of the hardware error, on the Microsoft a check c000021a, did not really solve and explain, are vague, and then use Google+baidu check, found that there have been many netizens have this problem, but, the majority of the answer is that the hard disk has unknown track errors, or the unknown hardware error, the latter can be convinced, the former feel that understanding error a hard, but also temporarily as a possibility. The computer reboot a few times, more miserable, the system can not enter, the same error, into a safe mode, you may go in. However, some people on the internet are not even safe mode to enter.

Seriously think about their own situation, just this period of time graphics card has been a problem, will not show, I guess will not be the graphics card has a problem, so change a friend of the graphics card a try, the problem still exists, it is really hard drive there are errors, with software multiple detection, there is no problem, this is really lost, the last heart a horizontal, Format Reload. After a few cups of coffee, a new installed system, first reboot, no problem, enter also no problem, it seems that the hardware is not a problem, think about the driver has not installed, will not be some of the driver out of the problem, because after playing the SP2 also updated some drivers, and then a driver installation, a start, there is no problem, It seems to have nothing to do with the drive, since reinstalling the system is no problem, it should be a system problem, and then began to install the commonly used software, restart, stop c000021a unknown hard error unknown hard error, again, Why did you just do that? is the software problem, but the hint is hard error ah, seriously think about what happened before, right, that day downloaded a winrar3.4 to install, will it be the problem? Because there is an extra hard drive, the system is installed with another hard drive, Do not install the software to use, Normal, and then install winrar3.4, restart, stop c000021a unknown hard error unknown error, ha, find out why, incredibly it, although it may be I downloaded this version of the problem, But still has the shadow, quickly uses back winrar3.3, everything is normal.

Originally, the software will also cause stop c000021a unknown hard error unknown hard error, I hope this experience to meet the problem of netizens a little help.

2. Virus-induced, generally in safe mode killing poison is OK