mysql extension won't work on vista?

["Jeff Emminger" <jemminger@xxxxxxxxx>]

hello,

i just installed php5.2 on windows vista business (official release 
version), running through apache 2.0.59, and i can't get the mysql extension 
to work.  i have libmysql.dll in %PHP%, %PHP% is in the system path, and 
php_mysql.dll in %PHP%/ext.  i've even put libmysql.dll in %WINDOWS%. 
php.ini has extension_dir pointing to %PHP%/ext, and has 
extension=php_mysql.dll uncommented.

restarted apache/rebooted... nothing but the error "Fatal error: Call to 
undefined function mysql_pconnect()" if i do something like $db = 
mysql_pconnect(DB_SERVER, DB_UID, DB_PWD);

is there some trick to getting this to work on vista?  this same setup 
worked fine on my XP machine.

thanks,
jeff