It seems like you're encountering some issues with your CD/DVD drive after upgrading to Windows 7. Let's explore some troubleshooting steps to address the problems you're facing: 1. Check Device Manager: Since you have already checked for any warnings or errors in Device Manager, it's good to know that there are no apparent driver issues. However, you can try updating the driver for the CD/DVD drive manually, just to be thorough. 2. Compatibility Mode: Try running the CD/DVD drive in compatibility mode for Windows XP. Sometimes, older hardware may not work perfectly with newer operating systems due to compatibility issues. 3. Firmware Update: Make sure that the firmware for your Lite-On DH20A4P CD/DVD burner is up to...