Hi Mahesh,
Check that the registry load behaviour is set to 3 for the following keys:-
KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Excel\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Outlook\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\PowerPoint\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Word\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Office\Excel\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Office\Outlook\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Office\PowerPoint\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Office\Word\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Excel\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Outlook\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\PowerPoint\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\Word\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\WOW6432Node\Microsoft\Office\Excel\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\WOW6432Node\Microsoft\Office\Outlook\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\WOW6432Node\Microsoft\Office\PowerPoint\Addins\Laserfiche.OfficePlugin.Launcher
HKEY_CURRENT_USER\SOFTWARE\WOW6432Node\Microsoft\Office\Word\Addins\Laserfiche.OfficePlugin.Launcher
This should ensure that the office plug in will load everytime.
Cheers!