Cannot connect to MySQL

Hello,

First of all, I apologise if I do something wrong, because I'm new to this weird system.

For test purposes, I have installed Apache 2.2.14 with PHP 5.3.1 and MySQL 5.1.44 on Windows 7 Home Premium. However, whenever I try accessing MySQL via PHP, I get the following error:

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

MySQL's command line client is still working fine. I think that PHP simply does not see MySQL, though the settings in php.ini seem to be correct. Earlier (before I upgraded to Windows 7 and PHP 5.3) it worked. I've tried turning off the antivirus, because sometimes it may cause timeouts, but it didn't help. Can someone please help me fix this?
 		 	   		  
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