it seems u need some new drivers for ur notebook, go here and download the latest drivers for ur notebook it should help if not than please contact me
www.asus.com
click global
than click on download
this wil open
http://support.asus.com/download/download.aspx?SLanguage=en-us
there u search for ur notebook
select product : notebook
select series : L8400 series
select models : L84b
there u can find drivers for ur notebook
if u have xp than change the search in others than u wil see cdrom thats is your decoder
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