I had a similar 'write protect' problem for my EMTEC 16Gb pen drive after it got heavily infected with virus. I tried many tricks outlined here, and nothing worked. Downloaded 'restore' utility from EMTEC website and installed it. This utility has two options - format, and restore. Format didn't work. But 'restore' worked and my pen drive is now initialized and has become usable. Hope this information may help.
if your pendrive files have changed into raw files then only 2 things can make u r pendrive usable
1. format the pendrive using linux window it will format the raw files also
2. you can use software easeusdata recovery for recovery of files
bt may there is no software to format the pendrive in windows