display problem (theme?)

Hi all,

One of the websites I work on for work had a simple theme and has been fine since I installed it earlier this year. Now when it is accessed, the theme/layout doesn’t exist but the html still is available.

On the top this reads:
“/wp-content/themes/softgreen/style.css” type=”text/css” media=”screen” /> /xmlrpc.php” /> /xmlrpc.php?rsd” /> /wp-includes/wlwmanifest.xml” /> “

I also got an error message earlier from “mainnetsoll.com” that said my “web browser is too old”. I’m using the most recent Firefox and tried it on IE also.

Any thoughts on what has happened?
Can I fix this without reinstalling everything?