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Here are some things to try.
Certain Windows updates need to be installed on your computer before Internet Explorer 8 can be installed.
Start the Internet Explorer 8 installation and select the Install Updates check box in the setup wizard.
Click this button:
Reset Windows security settings
In the File Download dialog box, click Run, and then follow the steps in the wizard.
You might find that standard user accounts don't appear on the log in screen or when you try to switch users after you reset Windows security settings. The user accounts are still available on your computer. To make your standard user accounts visible again, follow these steps:
In the list of results, right-click Command Prompt, and then click Run as administrator. 管理者のパスワードまたは確認を求められた場合は、パスワードを入力するか、確認情報を提供します。
In the Administrator: Command Prompt window, type net users, and then press ENTER.
For each user that is in the list but is missing from the log on screen, type the following and then press ENTER:
net localgroup users accountname/add
Read the How to solve Internet Explorer 8 installation problems article online for other possible solutions.
If the solutions described in the article don't work, contact Microsoft Customer Support Services by going to the Microsoft Update Solution Center website to request support by e‑mail.
