Navigate the the location below in your registry and make the corresponding change.

Create or edit the existing DWORD value (string for Windows 98), named "BroadcastAddress" and set it to the broadcast address you wish to use in hexadecimal format. 

Restart Windows.

Key:[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP]
Value Name: BroadcastAddress
Data Type: REG_DWORD
Data:broadcast address in hexadecimal