Macro error when opening MSW or a document

[taxidimu]

MS-WXP, MSOffice2003.
When I open MSWord and any new or existing document, I always get the
following error messages (I translate):
The function you are trying to execute contain macros or contents that
require the support of macro language. At the installation of the
software you have chosen not to install the controls or support for
macros.
This error may occur for the following reasons:
1) protection level for macros set to
- high and the macro is not signed...
- high and the macro is signed, but you have chosen "deactivate
macro"...
- high or max, the macro was not signed and has been disabled by the
application...
2) another instance of the application has a block of the protection
setup that prevents modifications...
3) VBA not installed...
4) the certificate is no more trusted. in this case you cannot choose
the button "activate macro"...

The message is repeated several times for any startup or document.
In effect VBA is not installed.

But:
1) my documents have no macro
2) this happens also when MSWord starts
3) MSWord had worked correctly for time. Maybe this happens after a
MSOffice update, or after Acrobat writer installation.

Thank you.
tx