diff --git a/wp-admin/install-config.php b/wp-admin/install-config.php
index a12de63908..4eee8ed5b6 100644
--- a/wp-admin/install-config.php
+++ b/wp-admin/install-config.php
@@ -123,7 +123,7 @@ switch($step) {
             case "define('DB_HOST'":
                 fwrite($handle, str_replace("localhost", $dbhost, $line));
                 break;
-			case '$table_prefix  ':
+			case '$table_prefix  =':
 				fwrite($handle, str_replace('wp_', $prefix, $line));
 				break;
             default:
diff --git a/wp-admin/install.php b/wp-admin/install.php
index 533dbd290c..b26a4e34cc 100644
--- a/wp-admin/install.php
+++ b/wp-admin/install.php
@@ -656,8 +656,15 @@ foreach ($geo_option_data as $query) {
 <p>OK. We're nearly done now. We just need to ask you a couple of things:</p>
 <form action="install.php?step=3" method="post">
 <input type="hidden" name="step" value="3" />
-<p>What is the url for your blog? <input name="url" type="text" size="60" />
-, now on to <input type="submit" value="Step 3" ></p>
+<p>What is the URL for your blog?<br />
+<?php
+$guessurl = str_replace('/wp-admin/install.php?step=2', '', 'http://' . $HTTP_HOST . $REQUEST_URI);
+?>
+  <input name="url" type="text" size="60" value="<?php echo $guessurl; ?>" />
+</p>
+<p>On to 
+    <input type="submit" value="Step 3..." />
+</p>
 </form>
 
 <?php
diff --git a/wp-admin/upgrade-functions.php b/wp-admin/upgrade-functions.php
index 9e4a9a820e..fcb4388b32 100644
--- a/wp-admin/upgrade-functions.php
+++ b/wp-admin/upgrade-functions.php
@@ -455,7 +455,7 @@ function upgrade_072() {
 }
 
 function upgrade_100() {
-	global $wpdb, $tableposts, $tablecomments, $tablecategories, $tableoptionvalues, $tableoptiongroups, $tableoptiongroup_options, $tableoptions, $tablepost2cat;
+	global $wpdb, $tableposts, $tablecomments, $tablecategories, $tableoptionvalues, $tableoptiongroups, $tableoptiongroup_options, $tableoptions, $tablepost2cat, $tablelinks, $tableusers;
 	maybe_add_column($tableposts, 'post_name', "ALTER TABLE `$tableposts` ADD `post_name` VARCHAR(200) NOT NULL");
 	maybe_add_column($tableposts, 'to_ping', "ALTER TABLE $tableposts ADD `to_ping` TEXT NOT NULL");
 	maybe_add_column($tableposts, 'pinged', "ALTER TABLE $tableposts ADD `pinged` TEXT NOT NULL");
@@ -464,6 +464,8 @@ function upgrade_100() {
 	maybe_add_column($tablecategories, 'category_nicename', "ALTER TABLE `$tablecategories` ADD `category_nicename` VARCHAR(200) NOT NULL");	
 	maybe_add_column($tablecategories, 'category_description', "ALTER TABLE `$tablecategories` ADD `category_description` TEXT NOT NULL");
 	maybe_add_column($tablecategories, 'category_parent', "ALTER TABLE `$tablecategories` ADD `category_parent` INT(4) NOT NULL");
+	maybe_add_column($tablelinks, 'link_rss', "ALTER TABLE `$tablelinks` ADD `link_rss` VARCHAR( 255 ) NOT NULL;");
+	maybe_add_column($tableusers, 'user_description', "ALTER TABLE `$tableusers` ADD `user_description` TEXT NOT NULL");
 
 	// Create indicies
 	$wpdb->hide_errors();
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index f45d37042b..9e37b0f252 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -541,7 +541,8 @@ function url_to_postid($url = '') {
 /* Options functions */
 
 function get_settings($setting) {
-	global $wpdb, $cache_settings, $use_cache;
+	global $wpdb, $cache_settings, $use_cache, $REQUEST_URI;
+	if (strstr($REQUEST_URI, 'install.php')) return false;
 	if ((empty($cache_settings)) OR (!$use_cache)) {
 		$settings = get_alloptions();
 		$cache_settings = $settings;
diff --git a/wp-settings.php b/wp-settings.php
index ea050a9819..252dfb4715 100644
--- a/wp-settings.php
+++ b/wp-settings.php
@@ -17,13 +17,19 @@ $tableoptiontypes         = $table_prefix . 'optiontypes';
 $tableoptionvalues        = $table_prefix . 'optionvalues';
 $tableoptiongroups        = $table_prefix . 'optiongroups';
 $tableoptiongroup_options = $table_prefix . 'optiongroup_options';
+define('WPINC', 'wp-includes');
+require (ABSPATH . WPINC . '/wp-db.php');
+
+$wpdb->hide_errors();
+if (!$wpdb->get_row("SELECT * FROM $tableoptions LIMIT 1") && !strstr($REQUEST_URI, 'install.php')) {
+	die("It doesn't look like you've installed WP yet. Try running <a href='wp-admin/install.php'>install.php</a>.");
+}
+$wpdb->show_errors();
 
 // This is the name of the include directory. No "/" allowed.
-define('WPINC', 'wp-includes');
 
-require (ABSPATH . 'wp-config-extra.php');
-require (ABSPATH . WPINC . '/wp-db.php');
 require (ABSPATH . WPINC . '/functions.php');
+require (ABSPATH . 'wp-config-extra.php');
 require (ABSPATH . WPINC . '/template-functions.php');
 require (ABSPATH . WPINC . '/class-xmlrpc.php');
 require (ABSPATH . WPINC . '/class-xmlrpcs.php');
@@ -35,7 +41,7 @@ require (ABSPATH . WPINC . '/kses.php');
 // We should eventually migrate to either calling
 // get_settings() wherever these are needed OR
 // accessing a single global $all_settings var
-if (!isset($_wp_installing) || !$_wp_installing) {
+if (!strstr($REQUEST_URI, 'install.php')) {
     $siteurl = get_settings('siteurl');
 	// "When trying to design a foolproof system, 
 	//  never underestimate the ingenuity of the fools :)"
@@ -98,5 +104,7 @@ if (!isset($_wp_installing) || !$_wp_installing) {
 
 } //end !$_wp_installing
 
+
+
 require (ABSPATH . WPINC . '/vars.php');
 ?>
\ No newline at end of file