Hi, I have installed typo3 winstaller 4.4.6 and when I run it typo3 is not able to connect to the db.
However looking at log files everything seems to work.
I have installed also 4.4.5 and works correctly
Try 4.5.0 Version with PHP 5.3.3 and MySQL 5.1.54, this should work.
Version 4.4.6 has problems with IPV6!