SQL 2005 troubles

> 1. I cant seem to install enough of SQL 2005 to even an option to update
> to
> SP1 required for it to work. Windows Update says I have no update so I am
> unclear as to how I get the SP1 required to have SQL 2005 64bit edition up
> and running!
>
> 2. When and if I ever get SQL 2005 running what is a safe way to
> "uninstall"
> my old version which is sitting in windows.old directory. As intergrated
> as
> SQL is I fear removing the XP version might not be as easy as just
> deleteing
> the directory.
>
> 3. Should this whole thing proove to be a greek tradegy how do I uninstall
> the 64bit version that is currently on Vista becuase there is no uninstall
> shortcut that I can tell.
>
> I am familar with programs and how sometimes a simple uninstall is nothing
> more then a delete of a directory I fear that for SQL 2005 its far more
> intergrated then this.
>
> Thanks