Install Php Data Objects Extention di share hosting

Requirements Problem: Installing D7 gives pdo errors

Drupal 7 Marketing Video from Lullabot on Vimeo.
 
Starting over, I deleted all the files and the database. I extracted Drupal7 and made the db again. The only error at first was that register_globals was enabled.
There were no pdo errors. Original error was fixed with this line in the php.ini file (didn't exist yet) in public_html:

register_globals = Off

Tried the install again and register_globals was fixed,
BUT the pdo errors (original post) showed up.
 
The solution was to add these four lines to the same php.ini:

extension=pdo.so
extension=pdo_sqlite.so
extension=sqlite.so
extension=pdo_mysql.so