First, you need to know how to call this tool. Press Win+R to call up the running window, enter the "SIGVERIF" command and run it (Figure 1). In the file signature verification window, click the "Start" button at the bottom of the interface to start scanning the digital signatures of important files in the system (Figure 2). The scanned items include system device drivers and system files.

Tip:

If you click the Advanced button, you can also set and customize the file signature log file. You can view the generated log file by clicking View Log (Figure 3).

After scanning, if all the displayed files are digitally signed, it means that everything in the system is normal and all the files meet the signature standard of Microsoft Windows. However, if there are items with failed digital signature in the scanning results, we need to take them seriously and check them carefully.

Generally speaking, if the device driver has not been verified by signature, it is likely that the merchant's device has not been verified by Microsoft digital signature, but the device can still be used normally, which is a normal phenomenon.

However, if a system file of unknown origin fails to pass the signature verification, it is necessary to find out its specific origin, search relevant information online when necessary, and delete and uninstall it decisively if it may be a file that threatens the security of the system.