Margin Calculator Installation Instructions Note: This program requires VBRUN300.DLL to be in your Windows\System directory. 1. Copy all .VBX files to your Windows\System directory. 2. Copy MARGCALC.EXE to a directory of your choosing. 3. Add Margin Calculator to a program group by using Program Manager's File|New... facility or Run Margin Calculator by using Program Manager's File|Run... facility