wsh - SendKeys not working in Windows 7 -

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i using code in windows 7 ultimate , not working allow me sign in site. see wrong it?

    set wshshell = wscript.createobject("wscript.shell")     call wshshell.run("http://www.gmail.com", 1, false)      wscript.sleep 2000     wshshell.sendkeys "username"     wscript.sleep 1000     wshshell.sendkeys "{tab}"     wscript.sleep 1000     wshshell.sendkeys "password"     wshshell.sendkeys "{tab}"     wscript.sleep 1000     wshshell.sendkeys "{enter}"     wscript.quit()


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