problem and problem again....

this is my first blog in this year...

ok i was reinstal my windows xp, after long time few day's ago..
in this part i install too for web developtment, like apache php and of course mysql...
after process installation apache and php, next i will activated mysqli and mbstring extension in php.ini
to check what if mysqli extension has been loaded i use phpinfo() function.
obvious after checking in html result from phpinfo i don't find mysqli only mbstring, i think i have mistake..
but i don't sure coz many time i am installing this extension with this method..
only remove comment "extension=php_mysqli.dll " and adding the "extension_dirs=c:\php\ext" variable in php.ini
like usually and usually it's fine, but only today... (not know for future.... :) )
and error log in apache has produced this word

"PHP Warning: PHP Startup: Unable to load dynamic library 'c:\\php\\ext\\php_mysqli.dll' - The specified module could not be found.\r\n in Unknown on line 0:"

This error log warn me if php_mysqli.dll it's not in the place..
it really strange coz php_mbstring.dll is loaded sucessfuly and why php_mysqli.dll not.
i try another extension like php_mcrypt.dll, etc.. it' same with error..

so i try looking in google why this can be happen..
many argument of people that definition cause of this problem
after searching i still don't find the root of cause this problem.. and really make confuse..
but after few hour i find maybe just temporary fixes for this problem, with copying libmysql.dll in the php directory to c:\windows\system32 directory and mysqli extension can be loaded successfuly..

may be later i found causing for this problem ....

GBU..