How can I make my flash drive writable again?

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I have a new 64 GB Corsair flash drive that stated in the spec’s that it was both Mac and PC compatible, so I used it on my Win 7 Pro 64-bit box for a while then I used it on my iMac to put a movie on. When I put it back in my Windows PC and tried to cut and paste the movie I got a box saying it was read only. I also found out that it had reformatted itself to exFAT or the iMac did it? I have tried everything from the net that I could find to change this, went into Command Prompt and tried to change the attributes and format it but everything keeps coming back Can’t Do – Read Only. Any and all help would be greatly appreciated.

Thank You

Frank

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