在windows7上对ALT+TAB使用旧的方式
To restore the XP Alt-Tab functionality simply, lauch regedit, add a DWORD named AltTabSettings to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer and set its value to 1.

And here's a one line powershell script which does the above:

Set-ItemProperty HKCU:\Software\Microsoft\Windows\CurrentVersion\Explorer AltTabSettings ([int]1)