Resolved Vista Upgrade Error 80070103
By arungupta on Apr 23, 2007
After getting bounced around between Microsoft Tech Support and MSDN Tech Support (seem to be separate entities) and collecting almost 5 different toll-free numbers for them, I finally resolved the error with help from a very talented and patient MSDN Tech Support professional.
Basically, the machine had two partitions - one using Windows XP and other Linux. And somehow the Linux partition was coming out as the primary active partition. So every time I was trying to install Vista, whether from within XP or boot from DVD, it was trying to look for an empty space on this partition. And of course it was not able to find any space because this file system is not NTFS. Now when I look at the error message again, it makes sense. But can't the installation process find out that there are multiple partitions, one of them using NTFS, and then provide that information ?
With tech support help, I resolved the issue by deleting and formatting both the partitions. Another way to resolve this was to set Windows XP as the active partition following these instructions.
I almost lost faith in Microsoft Tech Support but this one talented individual helped me restore it.