不用試了，把這個 Patch 移除掉吧：

Windows XP Patch 811493 Causes System Slowdown
http://www.warp2search.net/article....=thread&order=0

Windows (XP) patch 811493 trouble
http://www.neowin.net/comments.php?...3&category=main

Latest Windows fix can cause slowdown
http://www.theinquirer.net/?article=9034