回复：太感谢了, 不过您说了四句, 我只明白可能性很多.

"运行一下 sfc /scannow 来查一下重要系统文件没有损坏。
sfc 须要download 吗? 还是只要run from start up."

directly run from start=>run. and may take a while.

"如果装了Daemon-tools之类的虚拟光驱软件的话，先卸掉。"

atapi.sys is mass storage controller system file in Windows. Sometime, programs with virtual drives, such as Daemon-tools, Alcohol 120%, GameDrvie, etc, will cause problem.


"你用的是SP1吧？"
Windows XP Service Package 1.

Don't forget to check your memory with memtest86.

多谢 多谢.
不谢 不谢。