1. The online banking security control of Bank of China cannot be installed, possibly because the browser is set to "Do not download and execute ActiveX controls", which leads to the failure to install the security control.

Second, the solution is as follows:

1. Select Tools -Internet Options-Security -Internet- Custom Level in the browser menu, and select Reset to Security Level-Medium in the dialog box. Click Reset and confirm. Pay attention to the necessity of enabling downloading signed ActiveX controls and running ActiveX controls and plug-ins.

2. After the browser is set successfully, please click the link "Please download and install security controls for the first time login" on the online banking login page to download and install online banking security controls.

3. In addition, if the software such as Internet Assistant is installed that prohibits the installation and operation of the control, please modify its corresponding settings so that the control can be installed and used normally.