I guess you can redownload service pack and reinstall it.

來源: longtermInvestor 於 2013-06-01 00:34:05 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (254 bytes)

回答: 請求幫助由 mythought2007 於 2013-05-31 15:17:48

Before on windows xp, you can download service pack as an exe file, then run it to update service pack. You can probably do that on win 7 too. If your computer successfully reverting changes, then next time I do not think it will take long time to start.