How Can I Fix - After installing Windows 7 my DVD drive won't read DVDs?

After installing Windows 7 my DVD drive won't read DVDs

I just installed Windows 7 using the DVD Drive and now it wont read any DVDs.
No matter what disc I put in, I always get the same message- 'Insert a Disc' and it ejects the current disc.
I've already tried updating drivers and uninstalling/rebooting.
I've also already tried using Microsoft Fix It multiple times, but it keeps failing to fix the problem.
The drive is a Plextor PX-800A ATA Device DVD RW drive and I'm running Windows 7 Pro.
Any ideas how to get it working properly again?
Also I already checked for the upper and lower filters and they are non-existent.

Anwsers to the Problem After installing Windows 7 my DVD drive won't read DVDs

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Hi ThreeCrossThief,
1.
Do you have any CD/DVD burning software installed on the computer?
2.
Do you have an option to roll back the driver for CD/DVD drive in device manager?
Step 1: If you have any CD/DVD burning software then uninstall them
a.
See Uninstall or change a program:
http://windows.microsoft.com/en-US/windows7/Uninstall-or-change-a-program
b.
Restart the computer once you've removed the program.
Step 2: Get in touch with the device manufacturer to check if there is any firmware available for the device and install it:
http://www.plextoramericas.com/index.php/forum
 
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Using Windows troubleshooter:

• Click on Search on Charm bar and type Troubleshooting. Click on the very first option.
• A new window will open. Click View all from the left pane.
• Scroll down to the bottom and click on Windows update.
• Troubleshooter window for Windows update will pop up. Click on NEXT. It may ask you for administrative permission.
• The troubleshooter will automatically detect problems and fix it.
• Now, close this window and try download/install the app which was previously showing error.

Another Safe way to Repair the Problem: After installing Windows 7 my DVD drive won't read DVDs:

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