Assuming the cartd doesn't have a switch on the side to turn off Write Protect, you need to change the Registry.
Press the Windows key and R together and in the Run box, type
regedit
then press Enter. Fromt the File menu, choose Export then note down the location of the backup you're about to create - just in case.
Navigate as you would in File Explorer to:-
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies]
“WriteProtect”=dword:0000000
Amend the dword from zero to 1 (one) then exit the Registry from te File menu. Restart the machine and it should work.
If that key doesn't exist, choose New DWord in teh Edit menu and write it yourself.