Oblivion and Two Worlds are great.

but maybe you should take a look at the gothic series,

Gothic 1 and 2 (expansion pack for Gothic 2 is night of the raven), are old,
the graphics outdated but great story.
If your new computer is really fast you can also try Gothic 3 .... Gothic 3
is unfortunally still buggy, but imho the graphics are better than Oblivion
and Two Worlds. the story is not as good as in Gothic 1 and 2 but the eye
candy is great.

You can download free demos, see screenshots and so on here
http://www.worldofgothic.com/


"peanutjake" <peanutjakeNO@SPAMnonesuch.com> wrote in message
news:F7033A37-C384-4A69-BA4B-CD6A3FA99121@microsoft.com...
>I finally got a computer fast enough to play games.
> My favorites are RPG games.
>
> What is the best RPG game that will work on Vista Home Premium?
>
>