I'm currently experiencing the same problem. I'm on an Inspiron E1505 laptop with Vista Home Premium 32bit installed. I did what Raj said about uninstalling the driver
(the one with the yellow ! by it), and then restarted my computer. However, upon the computer restarting, it attempted to reinstall the driver but instead I got a "Device driver software was not successfully installed." (For the record, the driver I need is TSSTcorp DVD+-RW TS-L632D ATA Device.)
I've tried installing drivers
for it by other means, too, but whenever I run the .exe program, it says "Drivers not found!!" or something to that effect.
Any other advice?