What should i do if pendrive suddenly shows its write protected

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i bought a pendrive...it worked quite well....then suddenly it started to show "the disk is write protected" whenever i try to delete or move items from the pendrive. i have tried the registry method,but i can not find a key after navigating some steps.what should i do?
i am using windows 7

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you might try this:

1) Click Start->Run.

2)Type regedit and hit enter.

4)Click on the plus sign next to HKEY_LOCAL_MACHINE

5)Click on the plus sign next to SYSTEM

6)Click on the plus sign next to CurrentControlSet

7)Click on the plus sign next to Control

8)Click on the plus sign next to StorageDevicePolicies

9)Write click on WriteProtect and click modify.

10)If the value data is 1 change it 0 and click ok.

11)Repeat steps 7 to 10 for ControlSet001 and ControlSet002 .

12)Close Registry editor and restart the computer.

-------------------------------------------------------------
If you don't find it in the registry, the best way is to create it yourself. Below is the procedure.

Start the Registry Editor

Go to the HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control key

If there is no key called StorageDevicePolicies, create it
.
You do this by right-clicking the HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control key, and selecting New > Key from the menu.

Select the StorageDevicePolicies key

From the menu select Edit > New > DWORD Value

Name the new value WriteProtect

Right-click the WriteProtect value and choose Modify

In the Value Data: box enter 1

Exit the registry editor, and restart your computer
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thank u
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bt now i cannot find ControlKey key after expanding CurrentControlSet
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look for "Control" not "ControlKey"
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finished all the tasks but still not working
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Does the drive work in another computer? If not, then the drive is broken.