[Eralex]

Вот AUTOIT-скрипт. Откомпилируй и всё будет ставится.
Поставь задержку в первом операторе побольше
для первого раза, чтобы разглядеть лучше.

AutoItSetOption("SendKeyDelay", 50)
Run("winamp508_full.exe")
WinWaitActive("Winamp Setup","License Agreement")
Send("{ENTER}")
WinWaitActive("Winamp Setup","Choose Components")
Send("{TAB}")
Send("{DOWN}")
Send("{SPACE}")
Send("{ENTER}")
WinWaitActive("Winamp Setup","Choose Install Location")
Send("{ENTER}")
WinWaitActive("Winamp Setup","Choose Install Options")
Send("{DOWN}")
Send("{DOWN}")
Send("{DOWN}")
Send("{DOWN}")
Send("{SPACE}")
Send("{ENTER}")
WinWaitActive("Winamp Setup","Internet Connection and Language Settings")
Send("{DOWN}")
Send("{DOWN}")
Send("{ENTER}")
WinWaitActive("Winamp Setup","Interface and Skin Selection")
Send("{ENTER}")
WinWaitActive("Add Media to Library")
Send("{TAB}")
Send("{TAB}")
Send("{SPACE}")
Send("{TAB}")
Send("{TAB}")
Send("{ENTER}")
WinActivate ("Media Library")
WinKill("Media Library")
ProcessClose("winamp.exe")