Deprecated - Someone please help me!

[محروم.كوم]

I don't know what's going on, but my forum is acting really messed up. When I click on a thread title, I get this at the top of the page:

Code:
Deprecated: Assigning the return value of new by reference is deprecated in /home/xxxxxxxx/public_html/forum/showthread.php on line 639

Deprecated: Assigning the return value of new by reference is deprecated in /home/xxxxxxxx/public_html/forum/showthread.php on line 1041

Deprecated: Assigning the return value of new by reference is deprecated in /home/xxxxxxxx/public_html/forum/showthread.php on line 1046

Deprecated: Assigning the return value of new by reference is deprecated in /home/xxxxxxxx/public_html/forum/showthread.php on line 1518

Deprecated: Assigning the return value of new by reference is deprecated in /home/xxxxxxxx/public_html/forum/showthread.php on line 1523

When I click on Vbulletin Options in Admincp, I get this at the top of the page:

Code:
Deprecated: Assigning the return value of new by reference is deprecated in /home/xxxxxxxx/public_html/forum/admincp/options.php on line 1150

Deprecated: Assigning the return value of new by reference is deprecated in /home/xxxxxxxx/public_html/forum/admincp/options.php on line 1185
I'm running 3.8.4 PL1. PHP is 5.3.1, and MySql is 5.0.89. Apache 2.2.14. __DEFINE_LIKE_SHARE__