Re: Pacchetti pgf

Ciao ho un problema:`
! LaTeX Error: Environment tikzpicture undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type H for immediate help.
…

l.202 \begin{tikzpicture}
[node distance=5mm]
! Undefined control sequence.
l.203 \node
(dot) [terminal] {.};
! Undefined control sequence.
l.204 \node
(digit) [terminal,base right=of dot] {digit};
! Undefined control sequence.
l.205 \node
(E) [terminal,base right=of digit] {E};

! LaTeX Error: \begin{document} ended by \end{tikzpicture}.

See the LaTeX manual or LaTeX Companion for explanation.
Type H for immediate help.
…

l.206 \end{tikzpicture}

[3] (s.aux)

LaTeX Warning: There were undefined references.

)
(\end occurred inside a group at level 1)`
Ho installato tutti i pacchetti pgf col comando di download su MikTeX .
Ed incluso:
`\usepackage{pgf}`
Ma sul foglio .dvi mi compare direttamente il codice
senza la figura, `\begin{tikzpicture}[node distance=5mm]
\node (dot) [terminal] {.};
\node (digit) [terminal,base right=of dot] {digit};
\node (E) [terminal,base right=of digit] {E};
\end{tikzpicture}
`
dove sbaglio?
Grazie

\usepackage{tikz}, non \usepackage{pgf}

Ciao
Enrico