Thanks, that's certainly identical to my problem. However, their possible solutions didn't resolve anything. I don't see an obvious way to slow down the burn process when Windows 7 is controlling the DVD drive - there is no option to change that. The only way I know to change burn speed is with the third party software that works with the drive (like Roxio Media Creator that came preinstalled). I have a hard time believing this is an issue with the CD/DVD itself. I have dual drives and I've tried burning the boot CD with both using Verbatim CDs, which never give me problems. Both CDs show the files OK when viewing them in explorer. I also tried burning a Verbatim DVD+R, same issue.
I then tried running their recommended "sfc /scannow" command, and it said it repaired some files but couldn't repair other files. I checked the "CBS.log" it generated, but there's a LOT of info in there - not much that means anything to me.
Anyways, as long as I have the "Reinstallation DVD", I'm OK. Don't want to spend to much time on it.