缺省都有的，unless you turned it off

来源: 于 2013-03-15 19:22:01 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

http://windows.microsoft.com/en-us/windows7/what-is-system-restore

http://pcsupport.about.com/od/fixtheproblem/ht/system-restore-windows-7.htm

http://www.youtube.com/watch?v=oGXbMyFaROw