In winxp system, many software or drivers are not digitally signed by Microsoft. Although some unsigned software will not affect the system operation, some will also cause some errors, so we'd better check whether this software has Microsoft's digital signature when downloading each software. So how do we check? Next, I would like to share with you the specific steps of winxp system to check whether the file has been digitally signed by Microsoft.

1. Click Start → Run, enter "sigverif" in the opened dialog box, and click OK to pop up "File Signature Verification";

2. You can directly click the "Start" button to query, but doing so will make the query time longer. We can specify the query range for it to shorten the query time. Click Advanced to pop up the Advanced File Signature Verification Settings dialog box, click Find Other Files Without Digital Signature in this dialog box, and then select the file suffix type to scan in Scan this file type. After setting, click OK to return to the interface.

Bian Xiao tip:

When setting in the interface, you can set the file range in the directory C:WindowsSystem32Drivers, which will shorten the query time.

After returning to the interface, click the "Start" button, and the program will enter the query state. Wait a moment, the system will give the query results.

In the query results given by the system, you will find that all the signed and unsigned drivers are in the Sigverif.txt file under the %Windir% folder (usually Winnt or Windows), and all the unsigned drivers will be marked as "unsigned". After determining which files are unsigned, you can back them up to other places, and then delete the files recorded in the original purpose. Once the system prompts you to be abnormal, you can resume them.

How to check whether a file has Microsoft's digital signature in winxp system is explained here. If you want to check whether the file has a digital signature, you can take the above method.