There are a variety of reasons why you cannot install the updates.
If you are the system administrator, ensure that Active X is enabled. Follow these steps to enable Active X.
- Select Tools, then Internet Options from the menu at the top of the Internet Explorer window. The Internet Options window will appear.
- Select Security from the list of tabs at the top of the Internet Options window. The Security tab will appear.
- Select the Custom Level button. The Security Settings window will appear.
- Scroll down to the Download signed ActiveX controls entry and select the prompt radio button.
- Scroll down to the Run ActiveX controls and plugins entry and select the enabled radio button.
- Select the OK button to accept the changes
- You may need to reboot for the settings to stick.
Also, as stated above, you may have to disable your security products or add microsoft updates to the trusted zone of your firewall.
Additionally there could be a RAM issue. If you are running too many processes, that can also cause problems.
If you are getting a specific error message when the updates fail, it would help if you can add them to the details section or in a new question. It is possible that you have corrupted operating system files that is blocking the installation of security updates.