If while click on open company.it show no company found or select data directory,then it may be the data location in location maybe changed or in BUSY path specfied earlier has been changed.You can follow these steps
Step 1 Open BUSY and then on main menu check set data directory
Step 2 Now in data directory,check the selected path
Step 3 Now on same path selected in BUSY,check same in your local drive and check any data exist in same folder path of which is given in BUSY
Step 4 If no data on selected path,you can check in your local drive,where your data is saved,then select path of that data folder
Step 5 Again in BUSY,in set data directory,paste or select same data folder path and save.
Step 6 Now click on open company and check the shown data which set earlier in BUSY