Yes those errors tell us here that you have not set your data directory to 777 permissions at every level or in windows this would be READ WRITE EXECUTE.
Here are our install instructions again so that you may familiarize yourself with the proper permissions.
http://www.photopost.com/installphp.html
So thats 3 errors I see here. One you where using a wrong path to photopost. Two you entered a wrong path to vbulletin and Three you have not set permissions on your photopost directories.
Let me know if anything else pops up but fixing those issues you should be fine especially since those errors would come at the end of install your almost there.
