Solution for IE8 certificate cannot be deleted under Win7

Security certificates are often used when we browse some special websites. We can only continue to access them after the browser has installed the corresponding certificate. For example, online booking website 12306, when we do not install the certificate, IE9 will prompt us to display only the security content.
Installing a certificate can make browsing more secure, and of course it will indirectly increase our troubles (to learn more about the browser's relationship with certificates). Sometimes there may be a certificate error, you need to delete the certificate under the other person's tab in the browser, and then re-install the certificate. If the certificate cannot be deleted in IE8 in Windows 7, you can refer to the following solution.
Under normal circumstances, we can delete the certificate as follows:
Open the Internet option, switch to the [Content] tab page, click the [Certificate] button to open the certificate manager, switch to [Others] People], select the certificate you want to delete, click the [Delete] button.

But we can see that the [Delete] button in the figure is gray, so how can I delete this certificate? The steps are as follows:
1, click the start button, type mmc, press Press Enter to open the console.

2. Click [File] and click [Add/Remove Snap-in] from the drop-down menu.

3. Find and select [Certificate] on the left and click the Add button.

4. In general, select the default [My User Account] and click Finish.

5. The certificate has been added to the [Selected Management Unit] list on the right, and click OK.

6. Back to the console, expand the [Certificate - Current User] node on the left. You can see a variety of related certificate type nodes.

7. Expand [Others]-[Certificate] node, you can see the certificate to be deleted on the right side; right click - "Delete".

8. Close the console, do not need to save the console; re-open the IE browser, and then look at the other people's tabs, the certificate has disappeared.

Okay, this is the end. If you can't delete it, follow the steps. Just select the account in step 4, pay attention to it.