Trouble Installing

I have a Dell Dimension 8400 currently running Windows XP, and I cannot seem to get past this problem. I have overcome several obstacles just to get to this point, but now I seem to have hit a dead stop, and I am not making any progress at all.

"A required CD/DVD drive device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now."

I get this error during the Windows 7 setup, right after I select the "Install Now" option.

I know there are other threads out there that have similar problems, and I have tried many of the solutions, but I just can't seem to get it working. Any help that can be offered is appreciated, and please let me know if you need more information from me.

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