Need help with microSD card: unable to add files on it from my laptop. does anyone know whats wrong?

I have a 16 GB SDcard. I have used it on my Samsung Galaxy Ace for around 8 months now and it has worked fine. Today I when I tried connecting it to my laptop to update my music I faced some problems.
My computer detects it and displays all files, but I am unable to make any changes to the the folders/files i.e. delete, cut or copy new files onto it. I was also unable to format it.
So I formatted it via the phone itself and tried it on my laptop again. I am still unable add new files to it.
However, it works without any problems on my phone.
Since I do not have my the USB cord, I am using a Samsung Micro SD adapter to access it on my laptop. Does anyone what could the problem be? And how can I add files from my laptop? Thank very much

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