WordPress.org

I've recently used this fantastic theme but I've got 2 problems:

1) Archive and About get me this error: "The requested URL /index.php was not found on this server.". My permalinks are setted in Month and name.

2) when I put the .htaccess in the root of my blog, the image is not displayed. What's wrong? I tried to read previos topics but I've found no solution.

Thank you in advance!

http://codex.wordpress.org/Using_Permalinks

I've used the PATHINFO solution and now if I click to the next or previous post works fine... but images are not displayed! I've put into the root the thumb.php file and the .htaccess, created a directory called cache with 777 permission!
I've only changed this row:

RewriteRule ^(wp\-content\/images\/.*\.)(jpg|JPG|jpeg|png|PNG|gif|GIF)$ /thumb.php?image=$1$2 [QSA,L]

'causee my images uploaded are into this directory!
What's wrong?

And I've yet the problem with Archive and About

I fixed the problem of Archive and About in header.php modifying this rows:

'<ul id="menu">