It would not hurt to let testdisk have a run at it. It will do a lot of things. Very handy tool.

Before doing anything with testdisk do 2 things.
First look at, in terminal;
Second run a search on testdisk and read up a little.

This is a widely used tool but like any tool needs to be used right.

It might be able to recover your file system but I doubt it. Each time you mount a system it gets harder to recover.

If you really want something that will work with MS I would also study up on file systems a bit. I do not have a thing to do with MS at all but last I heard they had not patched their system to deal with ext4 at all. ext3 yes. I could well be way out of date though so check.

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Well, I may have had some luck with testdisk. I haven't been able to recover my partitions, but it does see all of my files when I analyze using the "none" option for filesystem type. I'm in the middle of using the "copy" function which seems to be copying out all of my data from the ext4 partition to an external usb drive that is mounted into the ubuntu system. Fingers Crossed that this works. It's a couple hundred gigs so it will take some time before I know for sure.

This why I love LinuxQustions.org you can come here and get what you need. This post worked for me. I have a 1TB thumb drive I got online. I wanted to use it as storage on my CENTOS-Server. Every time I tried to format this thing, and after about 5 time it becomes a stupid thing-now. I followed this post and it worked for me Thanks.