Error 404 Not Found

[DonVi]

I updated a few days ago and my joomla virtuemart stopped working when I go to the shopping cart. I get this error:

404 Not Found
The server can not find the requested page:

guitarrasquiles.com/index.php?option=com_virtuemart&view=cart&lang=es (port 443)
Please forward this error screen to guitarrasquiles.com's WebMaster.

Apache/2.2.31 (Unix) mod_ssl/2.2.31 OpenSSL/1.0.1e-fips mod_bwlimited/1.4 Server at guitarrasquiles.com Port 443




What I can do? joomla 3.6.3, virtuemart 3.0.18

[jenkinhill]

What I can do? joomla 3.6.3, virtuemart 3.0.18

What did you update and what from? You are using Joomla 3.6.3 so you must also consider that your site may be compromised.  If not, then UPDATE JOOMLA NOW.

See 
http://www.theregister.co.uk/2016/11/02/hurried_crims_target_30000_sites_to_pop_unpatched_joomla/
https://developer.joomla.org/security-centre/661-20161003-core-account-modifications.html
http://www.fox.ra.it/technical-articles/how-i-found-a-joomla-vulnerability.html
http://thehackernews.com/2016/10/joomla-security-update.html

Check if you have new Joomla users with administrator permissions - if so hackers have paid you a visit!

[DonVi]

I UPDATE joomla to 3.6.4 and not change