Problems w/ my site after upgrade

[barcena]

Hi guys, I did an upgrade to the site and now I have several problems;

1. The site it should be www.xxxxx.com/index.php now is www.xxxx/.php (the index word is missing, how can I fix this?)

2. The Plugin and Products have a problem as well, it says this:

Warning: Plugins are currently globally disabled in your options. In order for plugins and products to function correctly, you must enable the plugin system. Importing a product will do this for you automatically.

However when you click on the link nothing happens, not even trying to importing a product, and what is more, there is no Plugins and Product option from the forum options.

3. If I trick the site and put index.php I have this error if try to enter to any forum.

Database error in vBulletin 3.8.4:

Invalid SQL:

SELECT  thread.threadid,
thread.lastpost, thread.lastposter, thread.lastpostid, thread.replycount, IF(thread.views<=thread.replycount, thread.replycount+1, thread.views) AS views

FROM thread AS thread


WHERE forumid = 8
AND sticky = 0

AND visible IN (0,1,2)


AND lastpost >= 1258227639

ORDER BY sticky DESC, lastpost DESC
LIMIT 0,;

MySQL Error   : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 16
Error Number  : 1064
Request Date  : Monday, December 14th 2009 @ 02:40:39 PM
Error Date    : Monday, December 14th 2009 @ 02:40:39 PM
Script        : http://www.xxxxxx.com/for
 http://www.xxxxxxx.com/forumdisplay.php?f=8
 Warning: Division by zero in [path]/includes/functions.php on line 2398

It also says this: Warning: Division by zero in [path]/includes/functions.php on line 2398

Help guys please. Thanks.