Its a firmware problem, im really struggling to find a replacement, but basically the sony optiarc BC-5500A is a discontinued model, and on the sony website, it gives u a firmware download, but its not an up to date one, im having problems installing it,
http://www.sony-optiarc.eu/supportservice/downloads/bluraydrivesnotebooks/bc5500a.html
i hope it helps, but i dont kno if u need another version for Windows 7, cus as soon as i put it on i had the same problem as you.
Check your drives manufacturer may be a need to update drivers or new firmware
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done the drivers and firmware, still not helping
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