You could possibly try uninstalling and re-installing your management and reporting extensions for each product
Do you mean uninstall ePO, recheck in product? When I uninstall ePO, is it delete all data in Databse?
Menu -> Software -> Extensions
In there are the management extensions and report extensions required to manage your products checked into ePO.
The other option is to do it through the 'software manager'
Menu -> Software -> Software Manager