If you (or your organization) is lucky enough to get ahold of the Windows 7 RTM, you may encounter an issue that has been popping up for a small number of people.

After booting from the DVD (or USB Drive) that contains the Windows 7 installation files, and clicking Install, you will be greeted by an error message that says:

A Required CD/DVD Driver is Missing

I pounded my head against the wall for a while on this one. In my case it turned out to be a corrupt ISO file that was causing the issue, but here are some ideas for you to try before you throw your computer out a window.

(1) Download the Windows 7 ISO Verifier tool (http://www.istartedsomething.com/20090706/windows-7-iso-verifier/). It will check your ISO file, compare it to known good hashes and tell you if the image is good. Do this first!

(2) Unplug all unnecessary devices from your PC and attempt to install again.

(3) If you have a mixture of SATA and PATA devices, try to remove and / or replace the PATA devices and try to install again.

(4) Transfer the Windows 7 setup to a thumb drive (http://www.intowindows.com/how-to-install-windows-7vista-from-usb-drive-detailed-100-working-guide/), disconnect the CD / DVD-ROM and try to boot setup from that.

If that doesn’t work then post in the comments section and I will try to help you out.