URGENT, need to fix corrupted pen drive. How?!?

Okay, so I've got this really stupid pen drive, and unfortunately, it's the only one that I can use at the moment.

I need to submit data that's about 400 MB in size tomorrow in school, and will get whooped if I don't.

It's about six years old, and was lying around, as I was scavenging for a pendrive/CD.

As it's Sunday evening, I can't really buy anything right now.

The thing with this Drive is that my sister formatted it once(it was the first time she did so), and after formatting it, the size went from 1 GB, to 8 GB. :O

Although it could carry around only 1 GB of data in it, the 8 GB size still popped up every time it was plugged in, no matter which system.

And then, that pen drive was with my sister for quite some time, and the first thing I did when I got it, was that I had hit Format.

Now, after that, every time I try to copy any data in it, after about 150-250 MB of data transfer, it shows an error saying that the disk in Write Protected, and it stops the transfer after that, and if it's one big file, it cancels the transfer. :/

I formatted it, and ran Disk Check, and ticked both the options (Automatically Fix System Errors, and Scan And Attempt For Recovery Of Bad Sectors).

But it says Windows Cannot Complete Disk Check, if I tick both the check boxes, but when I do none, it finishes it successfully. :|

Please help me out, it's really important for me to fix this thing and get those files to school tomorrow, otherwise, I'm messed up! :(