prefs files for p7 are in C:Documents and SettingsOwnerApplication DataPoser 7 rather than the program folder. Poser 6 and earlier its in the program folder .

the runtime structure is critical in some area because the item will reference specific folders .

Its not a bad idea to create a backup of your runtime/textures runtime/geometry and runtime/libraries folders to save having to reload. Although Poser should not remove or overwrite the folders .