Can't create table

[greenspan]

Hi. I hope my post is in the right forum. Anyway, my site went down and got my backups from my host. I restored the files and DB. My site is running fine, however, I'm now getting frequent "vBulletin Database Error!" in my admin Email. Here's the message:

============================
Database error in vBulletin 3.8.3:

Invalid SQL:

CREATE TABLE IF NOT EXISTS taggregate_temp_1250002560 (
threadid INT UNSIGNED NOT NULL DEFAULT '0',
views INT UNSIGNED NOT NULL DEFAULT '0',
KEY threadid (threadid)
) ENGINE = MEMORY;

MySQL Error : Can't create table 'taggregate_temp_1250002560' (errno: 13)
Error Number : 1005
Request Date : Tuesday, August 11th 2009 @ 10:56:07 PM
Error Date : Tuesday, August 11th 2009 @ 10:56:07 PM
Script : http://www.mysite.com/forums/cron.php?rand=1250002564
Referrer : http://www.mysite.com/forums/showthread.php?t=2832
IP Address : 202.21.227.84
Username : Unregistered
Classname : vB_Database_MySQLi
MySQL Version :
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I'm guessing that it's a permission issue. The backup that I got was in the form of myd, myi and frm files. I pasted them into var/lib/mysql/<database> and has the permission of 755. I tried making it 660 but got more database errors. Can someone point me to the right direction? Thanks in advance.