Thanks Peter, but when there is no text visible in the menus, you don't know where to go to change the font!
I have solved the problem by removing Nvidia96 via Synaptic Package Manager (NVidia as the problem was suggested elsewhere) . When I restarted my computer a message box popped up advising that my graphics were low resolution (haven't got the exact wording) and offered options including restoring default setting. I did this and restarted and everything is back to normal.
Thanks Peter, but when there is no text visible in the menus, you don't know where to go to change the font!
I have solved the problem by removing Nvidia96 via Synaptic Package Manager (NVidia as the problem was suggested elsewhere) . When I restarted my computer a message box popped up advising that my graphics were low resolution (haven't got the exact wording) and offered options including restoring default setting. I did this and restarted and everything is back to normal.