Installs iTunes, prompting that applicationsupport.msi was rejected by the digital signature policy, which was caused by a setup error. The solution is as follows:

1. First, click the right mouse button in the lower left corner to pop up the menu and select Device Manager.

2. Find the portable device-Apple iPhone in Device Manager, and then click the right mouse button.

3. Then select the first item: automatically search for updated driver software.

4. After selecting automatic update, it takes some time to update. After two or three minutes, windows successfully updated the driver.

5. At this time, you will see automatic refresh when you return to the device manager, and you can see a message with the words USB Apple on the universal serial bus device. This shows that the equipment has really been updated successfully.

6. At this time, press the newly installed iTunes in the menu, you can view the information in the iPhone as normal as the previous old version, and even update the system.