Unable to install device driver software; code 39--please help!

My CD/DVD Driver doesn't work--insert a disc in to my laptop and I hear a brief whirring sound, then nothing. Tried the following - please see error message below. I'm a newbie at this so please be very detailed and specific if suggesting a fix, thanks so much in advance for your help!

I have a Sony VGN-FZ140E; OS = Vista Home Premium + Browser = Google Chrome. Hope the details below help?


SONY DVD RW AW-G540A ATA DEVICE

Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)

Check for solutions: Could not load driver software.

Description:
Windows was able to successfully install device driver software, but the driver software encountered a problem when it tried to run. The problem code is 39.

Problem signature:
Problem Event Name: PnPDeviceProblemCode
Architecture: x86
Hardware Id: IDE\CdRomSONY_DVD_RW_AW-G540A____________________1.74____
Setup class GUID: {4d36e965-e325-11ce-bfc1-08002be10318}
PnP problem code: 00000027
Driver name: cdrom.sys
Driver version: 6.0.6002.18005
Driver date: 04-11-2009
OS Version: 6.0.6002.2.2.0.768.3
Locale ID: 1033

Go to search type device manager.
In manager look for CD/DVD drives
In CD drives look for yellow warning markers, if found the driver is corruprt, replace. If no yellow marker, the driver is probably not the most up to date, upade.

Thanks Richard - next to SONY DVD RW AW-G540A ATA DEVICE in Device Manager there's a yellow triangle with an exclamation mark inside; I assume that's what you mean by a warning marker? If so--the driver is corrupt, but I don't know how to replace it?? Can you please help me with that? Thanks.

Replace that driver and I think that you will be up and running.
http://www.vistax64.com/tutorials/193584-device-manager-install-driver.html
When you use the tutorial rather then the suggestion, browse my computer, you may want to select the alternative method.
This is the easiest way.

I followed the instructions within the tutorial link you provided [thanks.] End result; see below:

Windows found driver software for your device but encountered an error whilst trying to install it.

CD-ROM Drive

Windows cannot load the device driver for this hardware. The driver may be corrupt or missing. [Code 39]

I'm not experienced enough at this to know what to do beyond this point...still stuck and DVD-less!!

Uninstall the old driver first, see how that works. Diconnect everything from the computer, printer, speakers. Just leave mouse, keyboard and monitor.

Here is a list of possible solutions to error 39
http://pcsupport.about.com/od/findbyerrormessage/a/code-39-error.htm