If you're doing uninstall/reinstall, and you are OK with removing your whole runtime directory, you may want to ...

1. uninstall Poser
2. Use a file browser and locate C:Program Filese frontier
3. Delete (or move) the entire directory.

**Note this will kill all the content in your Runtime folder!!

**If that doesn't fix it, then I would consider updating your video drivers, as the only other thing I can think of that would be "parsed" at Poser startup might be some OpenGL configuration file.  You probably should also open a ticket with e frontier support:
http://www.e-frontier.com/article/articleview/18?sbss=435

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