A) Insert the memory stick into the computer
Go to My Computer and under Devices with Removable Storage look for your card reader
Right-click on it and click Properties
In the pop-up box, sometimes there's an option to Remove write-protection. Change the status of this option and try again.
B) Remove your memory stick from the drive
Click Start > Run...
In the box type regedit and press OK
A new window will appear. Go to:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies
If you can't locate StorageDevicePolicies then you will need to create this folder
Right-click on Control and click on New > Key. Name this StorageDevicePolicies
Right-click on the new folder you created called StorageDevicePolicies and click New > DWORD Value.
Name this WriteProtect
Double-click on Write Protect and change the Value Data to 0 and then click OK
Close the Registry Editor and insert the memory stick into your computer
If there's nothing on it, you can always Right click on the flash drive them select Format > Quick Format (takes 2 seconds)