latex font error

[Nelson Hogg]

In attempting to "view" a document I get a number of the following kinds 
of font errors only differing it what font they have trouble with:

"Font T1/cmr/bx/n/10.95=ecbx1095 at 10.95pt not loadable: Metric (TFM) 
file not found"

If I export the document in tex form and then run latex on it the same 
problem arises. Can anyone help? This happens with Mandriva 2005 on my 
workstation, but not with the same distro on my laptop. And never before 
with ealier versions of Mandrake.
Thanks, Nelson Hogg