this has solved my problem.... tnx
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Method 3 of 7: Adjusting the Registry (Windows)
1Understand the risks. Windows operating systems have a "registry" which contains a great deal of important information. An error here could be making all memory cards and USB drives read-only. While the steps below will safely locate and correct this problem if present, do not change any other settings inside the registry editor, or you could make your operating system unusable.
Backing up your registry is recommended before editing it.
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2Open the registry editor. You can access the registry editor by entering regedit into the Search field in your Start menu. Windows 8 users can type regedit when viewing the Start screen. Press enter on your keyboard to search, then open "Registry Editor" when it appears.
If you can't find it, try searching for registry error or registry errors instead.
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3Navigate to HKEY_LOCAL_MACHINE. This folder can be found in the Computer section of the registry editor, in the left frame. Click the arrow next to HKEY_LOCAL_MACHINE to expand the folder.
4Navigate to the correct folder. Inside the HKEY_LOCAL_MACHINE, find and open the SYSTEM folder, then CurrentControlSet, then Control. Finally, scroll down until you find the StorageDevicePolicies folder. If this folder does not exist, see the next step.
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5Create the StorageDevicePolicies folder if it doesn’t exist. If you cannot find the StorageDevicePolicies folder, then you will need to create one before continuing. Right-click in the blank space in the Control folder. Select New, and then Key. Label it StorageDevicePolicies without spaces, exactly as shown here.
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6Change or create the "WriteProtect" entry to 0. Double click on the "WriteProtect" key in the StorageDevicePolicies folder. Change the “Value data” field from 1 to 0. Press OK. If you created a new StorageDevicePolicies folder, follow these steps instead:
Open the new StorageDevicePolicies folder, then right-click in a blank space. Select New, and then DWORD (32-bit) value. Name the new file WriteProtect. Double-click WriteProtect to open it, and put 0 in the value field. Press OK.
You must type each entry exactly, including capitalization, otherwise the key will not work.
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7Reboot your computer. In order for the registry changes to take effect, you will need to reboot your computer. Save all of your work before rebooting.