CD-RW firmware install wxp

I want to upgrade my Acer 8x4x32 firmware as it doesn’t recognize extra space CD-R (i.e. EMTEC 800 MB). I’ve found 5.JV as the last firmware for my drive (from 5.EV ), looking for it in serveral internet sites. I’ve downloaded the file, but when i execute the .exe file it checks my IDE cables but found no drive connected (and of course do nothing). I don’t know if it is a Windows XP problem or if i must do something prior to the upgrade.
Could you help me ??
Thanks to everybody that make possible this forums.
Greetings from Andorra.