Hi,
@dezign365 & @mark, I need a little more information, can you follow the step 1 ? In what step get the error?
Can you see the web server logs ? can access to error_log ? , maybe we can see something ...
If you are reinstalling, is possible you have already created the database and a ROOT_OSCLASS/config.php file that contain basic information, you should remove database and config.php if you already tried to install osclass.
Regards