Unknown Partition - Vista>XP

So I'm switching back to WindowsXP Pro from Vista x32. My drive is sectioned off into two partitions of roughly equal size.

I backed up everything I wanted to keep onto the secondary partition, and booted to my WindowsXP Pro install CD. It shows my primary partition as NTFS, which is fine, but my secondary partition, which I have all my backed up software, is [UNKNOWN].

I've seen this before, unfortunately (second time I've switched back to Vista, different computers.) and realized once I got into WindowsXP, I couldn't access the secondary partition -- WindowsXP ignores it.

Any ideas how I can get this shit to be recognized in WindowsXP? I don't feel like re-downloading all that stuff, plus I have no DVD Burner, and I have about 30GB backed up onto that partition.

Thanks in advance.

I see, so it's encrypted. That makes sense -- however I thought it had something to do with the file system Vista appends to the partition, which is apparently HPFS from the looks of it. From what I understand WindowsXP is unable to recognize that file system.

So would a decent solution to this problem be to install a seperate hard drive and copy my files onto there? Or would Vista render it unreadable as well?

Time to test it I guess.