PHP error after install?

[محروم.كوم]

First I had the error
Fatal error: Call to undefined function: mysqli_init() in /----/forums/includes/class_core.php on line 1128
Changing the type to mysql stopped this error however now it's coming up as...
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I've tried changing my PHP server type between 4 and 5 but that's not having an effect.

The install completed before I started having either of these problems.</SPAN> __DEFINE_LIKE_SHARE__