SanDisk Cruzer Blade 16GB write protected error

I have 2gigs of ram on my dell inspiron laptop. Since I learned that—under the fat32 format—maybe I could add more files that would come close to giving me a total of 4gigs. The disk would not open up for me to accept the additional files. I keep getting the same ole, same ole—This disk is write protected, bla, bla, bla, I have gone through all of the suggested remedies and no such luck. I can read the files, copy them back to my documents- but as soon as I try to write to or make changes to existing documents—those in Microsoft Word—same reply—this disk is write protected. 

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