Error 1402 usually occurs when you try to install a programme, for example, office. The error is related to windows installer, with messager like below:

Error 1402. Could not open key: <Keyname>. System error 1009.

Verify that you have sufficient access to that key, or contact your support personnel.

Cause: The reason why you are seeing this error is either that the windows installer service is not started or some registrys are blocking the installation.

To solve the issue,

First Solution: Start Windows Installer

Step 1: Turn on the Windows Installer service.

• 1.       Click Start, in the Search box, type services, and press Enter.
• 2.       In the Services (Local) list, right-click Windows Installer, and then click Properties.
• 3.       If the Startup type drop-down list is set to a value of Disable, select the Manual option from the Startup type drop-down list, and then click OK.
• 4.       Click the File menu, and then click Exit.

Step 2: unregister and re-register the windows installer

• 1.    Click the Start, in the Search box, type Command Prompt.
• 2.    Right click on Command Prompt and choose Run as administrator.
• 3.    In the Command Prompt window,copy and paste MSIEXEC /UNREGISTER, and then click Enter. Even if you do this correctly, it may look like nothing occurs, or you may briefly see an hourglass. After you run this command, the operation is complete.
• 4.   copy and paste MSIEXEC /REGSERVER, and then click Enter. Even if you do this correctly, it may look like nothing occurs, or you may briefly see an hourglass. After you run this command, the operation is complete.

Second Solution: Check for registry damage

Error 1402 is sometimes caused by registry problem. If you have installed certain programme before and later uninstalled it from your computer, there may be some left over entrys. The system will read these entrys and think that the programme is still there, resulting in failure of the reinstallation.

In such case, you will either use an uninstall manager to remove the left over entries from your pc, or use a registry fixer to clean the registry blocks. After removing these left overs from your computer, the programme will be installed smoothly.

Black screen is a problem that is as common as computer freezing. Normally, when you see a freezing computer, there is chance that you are going to meet black screen as well. This is basically caused by a number of potential problems that will prevent your PC from being able to operate correctly. Before you learn how to fix this error, you will need to know what can probably cause such problem.

Windows black screen crash can be caused by several reasons:

• Virus attack
• Graphic card driver corrupted
• Registry error or dll problem

Troubleshooting:

Step 1: Scan your computer with Anti-virus software

Virus and malware are quite possible to cause black screen. They can hijack system files and some important processes, causing the system to mess up, freeze, not respond or even crash. To avoid further and more serious damage, it is urgent to run a virus scan to clear out all virus and malware from the computer. 

Step 2: Run a system file check to restore the system files.

As mentioned on above, virus and malware can damage the system files, resulting in system failure. Thus, it is necessary to run a system file check to restore system files when you are able to boot up in your system. To do this:

• press Win+R button on your keyboard
• type cmd press enter
• type SFC /SCANNOW

Step 3: Update your graphic driver.

This can be done manually or by the help of a driver updating software. To manually update your driver, you need to check your graphic card name in device manager and then go to the manufacturer’s official website to look for the driver. Normally computer manufacturer will offer such driver as well.

Step 4: Download a registry cleaner in your computer.

Registry is a vital part to control how a computer runs. If certain registry is missing, programs, or even the system will not run consistantly, or just crash. It is always recommended to run registry cleaner regularly to keep your computer healthy and stable.

In Internet Explorer 9, some websites may not display correctly sometimes. For example, some parts of the page may be missing or become blank; the components may be displayed in a mess.  Sometimes, the website just does not display at all.

Since IE 9 is rather new and not very familiar within us, it is necessary to learn some tips on how to get it work smoothly.  If you find some webpages not displaying correctly in IE 9, there are several steps you can try to troubleshoot it:

Step ONE: Run IE 9 in compability mode

Run IE 9 in compability mode will enable the webpages to display as how they do in earlier versions of IE.

1. Open Internet Explorer by clicking the Start button . In the search box, type Internet Explorer, and then, in the list of results, click Internet Explorer.
2. Click the Compatibility View button  on the Address bar.

Step TWO:  Disable tracking protection for the website

1. Open Internet Explorer by clicking the Start button . In the search box, type Internet Explorer, and then, in the list of results, click Internet Explorer.
2. Click the filter button in the Address bar, and then click Turn off Tracking Protection.

Step Three:  Reset IE 9 to original settings

If you are seeing displaying problem recently, and this case has never happened before, it may be an add-on or setting problem. You may restore your IE to original state, which will very possibly solve the problem.

1.    Click the Internet Explorer Tools menu, or press Alt-T on your keyboard.
2.    Select Internet Options.
3.    On the Advanced tab, click Reset.
4.    Select the “Delete personal settings” checkbox.
5.    Click Reset.

And it is highly recommended that you download and install a registry cleaner to your computer, and have it clean your system errors and registry problems.It will rule out the possibility of IE problems caused by registry corruption.

If you are using Microsoft Internet explorer to view websites, you may receive error messages such as below:

Internet Explorer cannot display the webpage

The cause of the error varies from different case. There is no fixed solution for an “Internet Explorer cannot display the webpage” error. To solve the error, we will need to learn some troubleshooting steps:

Step 1: Test the issue with another webpage

If you do not receive an error message with other websites, the problem is probably limited to the one affected website. In that case, contact the owner of the website that is generating the error message. The site may be temporarily offline, or it may be experiencing other issues.

Step 2: Clear temporary internet files and history of your internet explorer

Internet Explorer 8 or Internet Explorer 9

1. Start Internet Explorer.
2. Press Alt to show the menu bar.
3. On the Tools menu, click Internet options.
4. Under Browsing history, click Delete.
5. Click to select the check box next to the following items
   • Preserve Favorites website data
   • Temporary Internet files
   • Cookies
   • History
   • Form data
   • InPrivate Filtering data (Internet Explorer or ActiveX Filtering and Tracking Protection data(Internet Explorer 9)
6. At the bottom of the window, click Delete.
7. When the deletion is finished, exit Internet Explorer.
8. Start Internet Explorer, and then try to access the webpage.

Internet Explorer 7

1. Start Internet Explorer.
2. On the Tools menu, click Delete Browsing History.
3. Click to select the check box next to the following items:
   • Temporary Internet files
   • History
   • Form data
   • Cookies
4. At the bottom of window, click Delete.
5. When the deletion is finished, exit Internet Explorer.
6. Start Internet Explorer, and then try to access the webpage.

Step 3:  Disable add-ons in Internet explorer

1.    1. Click the Internet Explorer Tools menu, or press Alt-T on your keyboard.
2.    2. Select Manage Add-ons.
3.    3. If Toolbar, Toolbar Helper, or Toolbar Notifier BHO is enabled, select each add-on and click Disable.
4.    4. Click Close.

Step 4: Clean out registry Errors

If above solutions cannot solve the issue, the problem may be more serious. It can be corrupted registry which results in the IE not supporting internet function. In such case, you will need to download a registry cleaner to clean out the errors. Its built-in fixing engine will automatically detect the errors within registry and restore the registry to a healthy state. It is the easiest and quickest way to solve the problem.