Step 1: First of all, we should know that the folders opened by win 10 system always flash back, which may be caused by system update patches. Open the control panel and click the uninstall program at the bottom of the program, as shown in the figure below:

Causes of PDF Flashback in win 10 System

Step 2: After entering the program and function interface, click to view the installed updates, as shown below:

Causes of PDF Flashback in win 10 System

Step 3: After entering the installed update interface, check the latest system update patch, as shown in the following figure:

Causes of PDF Flashback in win 10 System

Step 4: uninstall the latest system update patch, and then open the folder to see if it is normal, as shown in the following figure:

Causes of PDF Flashback in win 10 System

Step 5 If the folder still flashes back, it may be caused by system file corruption. Open the security guard and click System Repair, as shown in the figure below:

Causes of PDF Flashback in win 10 System

Step 6: After entering the system repair interface, start scanning the system contents. After the detection is completed, perform one-click repair, as shown in the following figure:

Causes of PDF Flashback in win 10 System