USB flash drive write protect error ?

Harini aku kene error write protect kat USB flash drive aku. bila nak delete file takleh. nak copy file takleh. bila masa plak flash drive aku ni write protected ? Maybe security policy sebelum ni menyebabkan semua removable drive takde write permission kot. ntah la aku pun tak ingat. aku disable write protect check kat registry :-

WARNING: Backup dulu registry

STEP 1 - Backup the registry
1. Unplug the USB flash drive.
2. Click Start > Run, type in regedit then click OK.
3. From the registry menu, click File, select Export.
4. Under Export range select All.
5. Name the file SNDK.reg and save it to the desktop.

STEP 2 - Disable the "Write Protect" permission in the Registry
1. On the left pane, click the "+" beside HKEY_LOCAL_MACHINE
2. Navigate to SYSTEM > CurrentControlSet > Control > StorageDevicePolicies.
3. On the right pane, right-click on WriteProtect and select Modify.
4. In the Value data field, type the number 0 (decimal value yer tuan2 & puan2)
5. Click OK.

settle.