Hello,
Maybe one time you lost a partition table … now it’s over !!!
I recently discovered ZAR Tools, ZAR means Zero Asumption Recovery, it can help you restore lost datas from a destroyed partition ^^ but due to my lack of finances -_-” I just used the trial version, with it you can only backup 4 directories by session. it’s already a good thing when you have to restore a Documents & Settings folder.
Here’s the link to ZAR Tools Website :
http://www.z-a-recovery.com/
And they have created some other usefull programs, like a Disk Viewer. Try everything you want.
Hope it will help someone one day, it helped me a lot ^^.