Strange characters at start up

Hi

When I open gvim it shows squares with weird characters. I have to go to:

Edit --> Select Font

select any and the characters disappear. Then the program can be used normally.

The same behavior if I open a fext file associated to gvim, like 'file.tex'

It never happened before.

How do I fix this?

Thanks

(I send the image in the attached file)

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