No Input File Specified urgent help needed

I needed to activate php5 via my cpanel account so i logged in went into the php version settings and changed it from 4 to php5.

I went to my site and all that is displayed is no input file specified.

I have searched around a bit but have come up with nothing that really works I dont seem to be able to find a php.ini file that some people keep mentioning.

Here is my .htaccess file from inside the main root www.

Options -MultiViews
# BEGIN W3 Total Cache
<IfModule mod_setenvif.c>
SetEnvIfNoCase Accept-Encoding (gzip|deflate) APPEND_EXT=.$1
</IfModule>
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} \/$
RewriteCond %{REQUEST_URI} !(\/wp-admin\/|\/xmlrpc.php|\/wp-(app|cron|login|register).php|wp-.*\.php|index\.php) [OR]
RewriteCond %{REQUEST_URI} (wp-comments-popup\.php|wp-links-opml\.php|wp-locations\.php) [NC]
RewriteCond %{REQUEST_METHOD} !=POST
RewriteCond %{QUERY_STRING} =””
RewriteCond %{HTTP_COOKIE} !(comment_author|wp-postpass|wordpress_\[a-f0-9\]\+|wordpress_logged_in) [NC]
RewriteCond %{HTTP_USER_AGENT} !(bot|ia_archive|slurp|crawl|spider) [NC]
RewriteCond /home/spot/public_html/wp-content/w3tc/pgcache/$1/_default_.html%{ENV:APPEND_EXT} -f
RewriteRule (.*) wp-content/w3tc/pgcache/$1/_default_.html%{ENV:APPEND_EXT} [L]
</IfModule>
# END W3 Total Cache

<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName spotcream.com
AuthUserFile /home/PRIVATE/public_html/_vti_pvt/service.pwd
AuthGroupFile /home/PRIVATE/public_html/_vti_pvt/service.grp

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/system.*
RewriteRule ^(.*)$ index.php?/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)$ index.php?/$1 [L]

</IfModule>

# END WordPress
# Add Expires headers
# ExpiresActive On
# ExpiresDefault \”access plus 5 days\”
# ETags
FileETag none
# WP-AVOID-SLOW END