回复：系统重装是否要重新买xp软件？有人说可去电脑品牌的网站下载，是这样吗？

You just need call Microsoft to re-active your XP as long as you have a XP licence. Just tell an Microsoft representative you need re-install XP. Even if you install an OEM XP, you still need call Microsoft to re-active your XP.

Linux is a better choice in long term.