Uninstall and network drive

[AH-NP]

Hi,

I've got a problem with a network drive.
I Install a part of my setup (only some files in a folder) on a network drive and if the network is no longer available I've got the message "Invalid Drive Z:\\ " and the uninstallation stops.
The file which are localized on the network are checked as : "permanent files - do not remove upon uninstallation"
Is it possible to uninstall my product and don't check if this network drive (or UNC path) exists ?

Thanks a lot !

AH-NP