Permalinks to 404

My WordPress starting acting up lately. I have WordPress 1.2 installed under my domain in a directory “btan”. However, my permalinks now all like to a 404 page. I have my Permalink settings set to /archives/%year%/%monthnum%/%day%/%postname%/ and the .htaccess file looks like this:
RewriteEngine On
RewriteBase /btan/
RewriteRule ^archives/category/(.*)/(feed|rdf|rss|rss2|atom)/?$ /btan/wp-feed.php?category_name=$1&feed=$2 [QSA]
RewriteRule ^archives/category/?(.*) /btan/index.php?category_name=$1 [QSA]
RewriteRule ^archives/author/(.*)/(feed|rdf|rss|rss2|atom)/?$ /btan/wp-feed.php?author_name=$1&feed=$2 [QSA]
RewriteRule ^archives/author/?(.*) /btan/index.php?author_name=$1 [QSA]
RewriteRule ^archives/([0-9]{4})?/?([0-9]{1,2})?/?([0-9]{1,2})?/?([_0-9a-z-]+)?/?([0-9]+)?/?$ /btan/index.php?year=$1&monthnum=$2&day=$3&name=$4&page=$5 [QSA]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/([_0-9a-z-]+)/(feed|rdf|rss|rss2|atom)/?$ /btan/wp-feed.php?year=$1&monthnum=$2&day=$3&name=$4&feed=$5 [QSA]
RewriteRule ^archives/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/([_0-9a-z-]+)/trackback/?$ /btan/wp-trackback.php?year=$1&monthnum=$2&day=$3&name=$4 [QSA]
RewriteRule ^feed/?([_0-9a-z-]+)?/?$ /btan/wp-feed.php?feed=$1 [QSA]
RewriteRule ^comments/feed/?([_0-9a-z-]+)?/?$ /btan/wp-feed.php?feed=$1&withcomments=1 [QSA]
Any ideas as to how to get my permalinks working again. Until then, my comments are unusable as well. Thanks in advance.