Method : Manually delete the wireless preferred network files
Step 1. Go to My Computer and double-click Local Disk (C:):
Step 2. Click on View and select Hidden items:
Step 3. Double-click Program Data:
Step 4. Double-click the Microsoft folder:
Step 5. Look for the folder Wlansvc and double-click to open it:
Step 6. Double-click the folder Profiles:
Step 7. Double-click the folder Interfaces:
Step 8. A single folder should be listed (unless the computer has more than one wireless adapter). Double click to open it:
Step 9. All the profiles for the wireless adapter are displayed:
Step 10. Open up each file in turn and read the SSID / wireless name and also the type of security. Once the file for the profile that you want to delete has been identified, simply delete it :
Note: Remember to uncheck Hidden items under View to avoid accidentally deleting important files.
