I *think* it doesn't like the fact that USER_AVATAR_WIDTH and HEIGHT are blank. Do you have access to something like phpmyadmin so you can run queries on the database? If so, try running that exact query and see what it comes back with for an error. We may need to adjust the default values in the createtable script.

I think the createtable script might need to be altered like this. Line 456 and 457 have this:

USER_AVATAR_WIDTH int(4),
USER_AVATAR_HEIGHT int(4),

They probably need to be changed to this:

USER_AVATAR_WIDTH int(4) default '0',
USER_AVATAR_HEIGHT int(4) default '0',