Thanks for your answers Personally I disagree with the statements that no extra firewall is needed.I have used Zone alarm for many years and never had a problem with any of the many problems that others have ( and I was operating before the Win 95 was introduced )
As with anything it is personal choice, Vista is an OS and security is ofered by others as a specilised area. On almost every new system ( even those running Vista 64bit ) the option to install security is offered.
If the makers feel it is required one must decide if it should be ignored or not. As no working alternative as been put foward, I shall click this as resolved and look elsewher to find what suits my needs.