You can choose this option from the Start menu, or you can simply hold down your computer's power button until it turns itself off and then press the button again. You'll need to do this during the first time the logo appears after rebooting. Keep tapping F8 until you see the advanced options menu pop up. Starting up your computer in this mode will bypass the Windows activation loop long enough for you to reset the timer for your XP trial. You'll need to wait a minute or so for Safe Mode to load. Exclude the quotation marks. You should see a dialogue window pop up after doing so. You may need to wait for a minute or so before the window comes up. This may also say OK. After doing so, you should notice that your desktop interface is now accessible. This will bring up the Run tool from which you can complete the fix. This command resets the Windows XP trial clock to 30 days.  When your welcome screen finishes loading, you should be able to log in like usual rather than being stuck in the activation loop.

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Write a summary of the previous text in Chinese:
重启电脑。 一旦电脑出现标志时，点击F8。 使用箭头键选择带命令提示符的安全模式。 按Enter。 在“命令提示符”程序中输入"explorer.exe"。 按Enter。 点击是。 按住Win并点击R。 输入"rundll32.exe syssetup,SetupOobeBnk"（去除引号）。 点击确定。 重启电脑。