CodeIgniter doesn't work with an MS Access database

Cheers!

For learning purpose, I think there is no problem of using MS Access. But if you insist of creating Web App and your DB is MS Access, that's "WOAH! Dude no!" MS Access has so many limitation and disadvantages. You can find these by googling it.

Just a piece of advice:
Using your experience with specific tool is not a problem but don't limit yourself. Try to explore some other tools! You will find it yourself that there are so many cool stuff available to you.

With Access I got stack becouse I had to make a big application in Office and I learned it on the fly. Office is great, but what I wanted to do is some real programming.

Do you have an ODBC driver installed on your system?

I just uncommented this line
extension=php_pdo_odbc.dll
in php.ini. But I don't want to go through all that.