Ubuntu Installation :: Restore Wubi After Windows Reinstall - Error: No Such Disk

I decided it was time to reinstall Windows 7 because it became increasingly slow. I know that there's a different solution to solve this problem, but as a user I'm just more satisfied with the noob friendliness of Windows. However, I know that it has its drawbacks so I had a dual boot setup with Wubi (30GB). My old configuration was as follows:

C: partition of size ~80GB with Windows 7 x64 installed
D: partition of size ~400GB with data and a wubi ubuntu at D:/ubuntu

So what I did was this:

- Backup all my personal files and D:/ubuntu on a external hdd
- Wipe the partitions using the windows installer
- Create a C: of 100GB and a D: of 380GB
- install windows 7 x64 on the C: partition

Now I would like to restore my backup of the old D:/ubuntu to a working dual boot system. I realize I may have missed some opportunities and the data may be gone, but I only found out about that when it was too late. I have tried installing wubi, and replacing the new ubuntu folder with the old one, but this did not work.

error: no such device: 9054698454696DC2
error: no such disk

I have also tried replacing only the root.disk file, with the same result. I searched for other people's solutions, but they did not seem to work in my case.