Steve,

>Before I install Service Pack 5, do I have to reinstall Service Pack 1,2,3 and 4 first or does 5 include all of the above?

You don't have to install the prior service packs.

>
>Also, the file I am about to install for Service Pack 5 is named
>VS6SP50T
>Version 5.50.4134.600
>
>Do I have the right file?
>

Probably :)

Do you have reason to believe it is the wrong file?