Windows 7 - Problem with DVD writer, Inspiron 1545

I have an Inspiron 1545, purchased in March 2009. It came with Vista Home Premium preinstalled. I installed Windows 7, RC1 a couple weeks after receiving the computer.

Everything worked great, until I installed the final version of Windows 7 Home Premium (32-bit).

My DVD writer keeps disappearing. The only way to get it back is to eject the drive. It immediately appears in "Computer" and will remain for maybe a few minutes, if that.

It appears that other people are having the same problem.

http://www.sevenforums.com/hardware-devices/28326-dvd-drive-disappearing-reappearing.html

http://social.answers.microsoft.com/Forums/en-US/GettingReadyforWindows7/thread/0366f327-b4f5-4077-8979-b81557e7d4c3

Does anyone know what's going on? What can I do to fix this?

Should I download a new driver? if so, where do I get it?

Does anyone have a link to Windows 7 drivers for my Inspiron 1545?