微軟 5/28 已經重新發布這個 811493 的修正檔, 先前是放在建議更新的項目
現在已經正式將它放在重大更新的項目裡面, 依照微軟的 faq 的說明, 先前
4/16 發布的 patch 會跟掃毒軟體的即時掃描功能衝突, 造成系統效能低落
因此修正這個問題之後, 重新發布這個 PATCH, 我先前已經移除舊的 811493
現在又重新安裝 5/28 的版本, 初步觀察似乎沒啥問題, 系統效能沒有下降

Microsoft re-issued this bulletin on May 28, 2003 to advise on the availability
of an updated Windows XP Service Pack 1 patch.
This revised patch corrects the performance issues
that some customers experienced with the original Windows XP Service Pack 1 patch.

Microsoft originally issued this bulletin on April 16, 2003. Subsequent to that date,
Microsoft has received reports of performance problems with the patch from some Windows XP customers.
Microsoft has investigated this issue and confirmed that there can be performance problems
when the patch is applied to Windows XP Service Pack 1 systems.
Microsoft is actively working on a revised patch for Windows XP Service Pack 1
and will re-issue that patch when it has been completed and fully tested.
The existing Windows XP SP1 patch does address the security vulnerability discussed in this security bulletin.