As you know, starting with the version of Windows XP, Microsoft has been constantly releasing so-called system updates and service packs. However, it is worth noting that in Windows 7, for some reason, the update error is much more common than in other operating systems. What to do with it, we will figure it out now.
Why does Windows 7 need an update?
If earlier system updates were mainly about security, recently (in particular for Windows 7) they even affect some basic device drivers, as well as specialized platforms such as the Microsoft. NET Framework, which are necessary for some programs to work and applications.

As for problems, these are mainly errors in Windows 7 Update and the file itself, which is responsible for starting the process of searching for and installing updates to the system. Now we will dwell on the causes of errors and solutions to some of the most common problems in a little more detail.
Error installing Windows 7 updates:reasons
If we talk about the reasons, unfortunately, there can be quite a lot of them. First of all, this should include a disabled automatic update, damage to the update file under the influence of viruses and malicious codes, mutual conflicts between the firewall, antivirus and the update service, incorrect completion of the update process, etc.
Despite the fact that in Windows 7 the update error can be present in different manifestations, for each situation you can find the most appropriate effective solution to the problem.
Checking automatic updates
To begin with, let's consider the simplest situation. It may very well be that the automatic search and installation of updates is simply disabled. To check these settings, you must use the "Update Center", where in the update method line there should be either an automatic start option or a search option followed by an installation suggestion.

Note that even if such parameters are applied, the system immediately starts scanning for official updates on the Web, or rather, on the official website of the Microsoft Update Center, since the system initially refers to it.
Manual update
If in Windows 7 the update error persists after enabling automatic mode, you can use manual search.

If everything goes smoothly here and the system prompts you to install the updates found, you just need topress the corresponding button. If the problem persists after this, more effective measures will have to be taken.
First of all, you need to check the system disk (on which, in fact, Windows 7 is installed) for errors. To do this, it is better to use the command line, and not the disk properties called through the "Explorer". For example, in the Run menu, you can enter the chkdisk c: \f command, which allows you not only to check, but also automatically correct system errors.
If the error occurs again and again, the reason for its appearance may be that the file itself, which is responsible for starting the update process, is damaged. In this case, you need to perform a deep scan with any anti-virus software, but it is better to use utilities that have the general name Rescue Disc, which are launched even before the system starts from optical media.
Firewall and antivirus issues
An equally common situation, when an update error appears in Windows 7 even after all of the above actions, there is a process conflict with a standard antivirus or firewall hidden from the user's eyes.
It is clear that the updater uses a reliable source (in this case, directly to Microsoft resources), so you can disable them for a while before starting the update process, but only if the preliminary scan showed the absence of viruses and threats.
Error after updating Windows 7
Now directly about the most common mistakes, apart from what happeneddescribed above. Windows 7 update error codes is a fairly large database, let's look at the three most common ones.

Error 643 is related to the inability to update the Microsoft. NET Framework. Other components of the system can be updated, but it is her update that causes the error. It should simply be removed from the system and reinstalled, after downloading the latest version from the official Microsoft website. By the way, with regard to uninstallation, it is better not to use the standard tools from the Programs and Features menu. In this case, advanced uninstallers will come in handy, removing absolutely all residual files and system registry key entries from the system.
One of the most powerful programs of this type is the iObit Uninstaller utility, which has a special Forced Uninstall mode.

No less common is the error with the code 800b0100. In this situation, the most acceptable solution is to use automatic problem fixers such as Fix It or the System Update Readiness Tool. In most cases, they are able to fix problems automatically, even without user intervention.

But the biggest headache for many users is the 0xc0000005 error. It appears after installing updates to the system. Typically, this type of error is caused by updates in the form of packages KB2859537 and KB2872339. Removing them allows you to get rid of annoyingerrors.
The easiest way is to type in the command line wusa.exe /uninstall /kb:2859537 or the same, but only for the KB2872339 package (of course, you must be logged in as an administrator). If this does not help, you will have to use the update log, in which all packages should be sorted by date. Most likely, some latest update is causing the crashes. Now you need to remove the packages one by one, each time restarting the computer until the error disappears (you can use the same command line). When the problem is fixed, you can manually install the updates again, but exclude the problematic packages from the list.