Index: wp-admin/includes/upgrade.php
===================================================================
--- wp-admin/includes/upgrade.php	(revision 10284)
+++ wp-admin/includes/upgrade.php	(working copy)
@@ -1119,8 +1119,9 @@
 	// Create a tablename index for an array ($cqueries) of queries
 	foreach($queries as $qry) {
 		if(preg_match("|CREATE TABLE ([^ ]*)|", $qry, $matches)) {
-			$cqueries[strtolower($matches[1])] = $qry;
-			$for_update[$matches[1]] = 'Created table '.$matches[1];
+			$table_name = str_replace('`','', $matches[1]); //Make sure it work if the table names have the ` style quoting
+			$cqueries[strtolower($table_name)] = $qry;
+			$for_update[$table_name] = 'Created table '.$table_name;
 		}
 		else if(preg_match("|CREATE DATABASE ([^ ]*)|", $qry, $matches)) {
 			array_unshift($cqueries, $qry);
@@ -1158,8 +1159,9 @@
 				foreach($flds as $fld) {
 					// Extract the field name
 					preg_match("|^([^ ]*)|", trim($fld), $fvals);
-					$fieldname = $fvals[1];
-
+					$fieldname = str_replace('`','', $fvals[1]);
+					$fld = preg_replace("/`([^` ]+)`/", "$1", $fld);
+					
 					// Verify the found field name
 					$validfield = true;
 					switch(strtolower($fieldname))