About windowsxp system disk installation problem

About windowsxp system disk installation problem My computer has a long time online, sometimes infected with some virus Trojans, causing the computer to slow down, or unable to start at all, then I will Re-doing the system with the purchased windowsxp system disk, the system can be installed normally at the beginning, but then there will be such a situation, in the process of reinstalling the system, for example, when it is 50% or 70,80%, There is a prompt, this prompt is all in English, there is no Chinese, but probably means that the A disk has an error. After this prompt, the system can't continue to do it. This A disk is not the long jack on the computer host. What? Here is the place to insert the 3.5-inch floppy disk. Is there a mistake here? Indeed, now I press the button next to the jack, the indicator light is not lit, no response. Does this mean that there is a problem with the A disk of my computer? But I don't know if this long strip jack is an A disc jack. Even if it is, then will the problem affect the system panel loading system? Is it possible that the system has a problem with the disk? The system disk is often used, and scratches appear on it. Will it be impossible to install the system? In addition, sometimes the computer is reinstalling the system. If the above situation cannot be continued, if you restart the computer and install it several times, try it several times and install the system normally. What is going on? Please master Thank you very much!