[MiKTeX] Helvetic fonts not available from pdflatex

[Juan I. M. <mo...@un...>]

I have just updated my miktex software and I found the following problem:

When I use PdfLaTeX with a (beamer) document using helvetic fonts I get the 
messages below and the generated pdf document  has not the corresponding fonts.

Any solution?

-------------
[13] [14] [15] [16] [17] [18] [19] [20] [21] [22] (presen-IUMA.aux) )
(see the transcript file for additional information)<C:\tex\texmf\fonts\type1\b
luesky\cm\cmmi10.pfb>Trying to make PK font "phvb8r" (at 657 DPI)...
"makemf" --verbose "phvb8r"
"ttf2pk" -q -t "phvb8r"
makepk: "phvb8r.pk" could not be created.

Warning: pdflatex (file phvb8r): Font phvb8r at 657 not found
<C:\tex\texmf\fonts\type1\bluesky\cm\cmsy10.pfb>Trying to make PK font "phvr8r"
(at 600 DPI)...
"makemf" --verbose "phvr8r"
"ttf2pk" -q -t "phvr8r"
makepk: "phvr8r.pk" could not be created.
.......


Juan I. Montijano              e-mail:  mo...@un...
Dept. Matematica Aplicada      Tf.:     +34 976 761120
Universidad de Zaragoza        FAX      +34 976 761125
50009-Zaragoza (Spain)