phpinfo() not detect mysql after system restore(windows)

mysql

[tatomiu]

i using 2 version php on my localhost php4 and php5, mysql5, and using os windows xp. my computer with this setting can work properly. but now i have problem after doing system restore. phpinfo() not detect mysql on php5 but on php4 mysql can work properly.
can anyone help me...!
iam newbie...
thanks before

[Habtom]

Though I don't have any idea why that is happening, you could simply try reinstalling PHP 5.0 and see if it makes a difference.