Lost partition after Windows reinstall

Hi!

Yesterday I had issues with Windows, it didn't start-up, so I decided to reinstall it. I did this recently and I could choose to reinstall it to another hard drive with keeping the data... I have a 250GB HDD with partition C and E, and a 500GB HDD with partition D.

Now, when the partition console appeared in the installation I choosed to install it to partition D. Now there were no option to install with keeping the data, it only suggested to format it. So I said NO.

But when I went back to the partition screen it said that partition D is unknown :cry I did nothing, I'm sure the data is still present!

So, I formatted c instead and reinstalled windows. No it says that partition D is unformatted and in RAW format!!

Could you please help me? I only pointed Windows to install itself to D, and when it asked if I want to remove the data I choosed NO!

I really really hope there is a way to recover this disk...

Thanks in advance!

 

Sorry, couldn't find an edit button...

Here is a screenshot from System manager. The D drive which was one partition with 465 GB and app. 86,39 GB free space shows up in three parts now:

146 GB healhhly, 86,39 free space and 232,88 GB which is not reserved. Any idea???

I really did nothing, tried to install windows to this partition but after asking for a format and data lass I clicked NO.

http://img142.imageshack.us/img142/1364/partitions.jpg

 

Never mind! I fixed the problem with a program called Testdisk.