This happened last year on a faulty major update on windows 10 which was eventually pulled by Microsoft. The best advice I can give is for you to note the number of the update you think may have caused the problem and then google problem with kb* .
btw you may have had other problems that you have not yet discovered , open word and type @ with shift and the correct key , did it print @
go on web and go to say amazon , does it show dollar prices.
if you get the wrong symbols in word go to language and region settings and reinstall the uk English pack , you will also see settings for web on this page , after making changes do a restart for all software to recognise you made the changes.