When installing with windows you must use forward slashes in PHP and MYSQL. I know everyone in windows world is use to backslashes
This to correct this in Admin => Global Options set your data and uploads server paths as such.
E:/Inetpub/Chocolate/forum/photopost/data/
E:/Inetpub/Chocolate/forum/photopost/uploads
Then in Admin => Storage Options hit revert paths TWICE to load the new paths.