how can install package distinguish between new install and reinstall ?

[#1]

I have scripct based install application projcet.
this project make XXX.exe install pakage version.

now, i must change XXX.exe intall version to XXX.msi install version.
so, I make XXX.msi intall version by using Basic MSI Project.

but I have one problem.
This new install version( XXX.msi) does not detect old install verion.
I install old version driver ( XXX.exe).
and If i clicked new install version( ex XXX.msi), XXX.msi version show
new install dialog.

this case, I want to show maintenancewelcome dialog.

this two version have same operation.
so this is same intsall application, they only change intall package format.

Do you have way to solve this problem?

[palanisamy]

MSI project doesnot able to identify the script based project, the only way to uninstall the script based version product and install the MSI project.