Corel Draw Home and Student V7 Cannot Use Save As Open or Export

Hello I'm hoping an expert can help. I have Corel Draw Home and Student V7.

It is not a trial version and I know it's old and not supported any more but it was working ok until this two days ago. Now I cannot Open files or use Export or the Save AS function. They are not greyed out but when I click on them nothing happens, eg no drop down box pops up with options to save as in other formats. I tried uninstalling and reinstalling the programme but it made no difference. I'm stumped. I'm using Windows 10. I tried tech support but they just said I need to buy a newer version. 

Any help or ideas much appreciated. Thanks