Hmmm... of course it's your choice which way you want to try resolving this, so I'm following up on all three options here!

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Changing your card reader drive letters is very straightforward. I always do it on all new PCs that have a built in card reader. You will then be able to use drive E: again for your content disk drive. This seems to me the easiest way forward.

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The LibraryPrefs.xml file should be in your user profile. If you have Windows XP it should be something like:

C:Documents and SettingsApplication DataPoser ProPoser.ini

If you can't see a folder called Application Data, you need to tell Windows to show hidden files and folders. (Tools - Folder options - View - Show hidden files and folders).

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To do a clean install, you need to delete the Program Files Poser Pro folder after uninstalling, and also the Poser Pro preferences folder in your profile (as mentioned above). Poser will re-create all of this from scratch when you re-install and run it.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)