You do not need to uninstall VirusBarrier X5 or NetBarrier X5 before installing VirusBarrier X6. Your X5 software will automatically be uninstalled when you install VirusBarrier X6.
By default, when you install VirusBarrier X6, your NetBarrier X5 settings will be automatically imported into VirusBarrier X6.
Please note that you can also manually import your settings from NetBarrier X5 into VirusBarrier X6. To do this, you must first Export your NetBarrier X5 settings from the File Menu in NetBarrier X5 and save them. To Import the settings into VirusBarrier X6, you must change the file extension of your saved NetBarrier X5 settings to .vbx6settings. The settings file can then be Imported through the File Menu in VirusBarrier X6.