Hello, landlord. In fact, this question is very simple. Whether you have a digital signature depends entirely on whether your system is genuine or not. Generally, your own Microsoft XP system is pirated, so when you install the graphics driver, you will be prompted that you don't have a digital signature. In fact, the driver of digital signature can be found online now, but this problem is basically not a problem. Whether there is a digital signature or not is exactly the same, which has no influence on the performance of the graphics card and the whole computer. We can ignore this problem.

Completely original, I hope it will help you.