Restore sage line 50 V 8

just to explain my problem sage has various tabs like products, financial , customer. If any of these tabs are clicked then we get a sub menu so when customer tab is clicked there is a sub menu beneath new, record price list activity etc and also a list of customers. When the product tab or financial tabs are clicked there are no sub menus showings where they should be and also there is no data, but a blank space see image 1. If you click in the middle of the screen one entry shows image 2, if you then click or scroll then the second entry shows img 3 and the more you scroll the more entries appear. img4 The side tabs for scrolling up and down do not work if you have have some entries displayed and take the pointer to the slide tab then the screen goes blank again . This only happens with products and financial tabs, have you come across this before and are you able to resolve this Normally if I click on either of these tabs the sub menu appear and the data is automatically populated in the space below so that the slider tab can be used to go up and down. The other tabs work without any issues only product and financial are a problem