auto repair installer

Hi,
If the user deletes the installed files from the machine, is there anyway nsis can repair it and install the files again automatically?
InstallShield does "repair", I am not sure whether it is possible with nsis?
Any help will be appreciated.
thanks
Suresh M

it's possible, but to my knowledge there's no finished function to do this - as different installers have different needs. basically you can check a condition of an existing installation when you launch your installer and make comparison. on difference, you can offer the user a repair function which calls a different function or section in your installer.