Ok guys help a fellow Zen Cart'er out:

I had Zencart 2.7x running fine on bl uer ip per DOT com which is hosted by BlueHost.com.

Last week I decided to upgrade it to 3.x buy downloading the upgrade. After downloading the files to my computer, I uploaded the folders and files to the server using my FTP program. Everything went fine, except after doing that, I went to the site, everything on there said "illegal access".

I called the hosting company up and had them do a full backup, and now I get a "HTTP 500" error.

Any input on this?

Should I do a full install again? Will that take away my excising products, settings, stylesheets, pictures, etc?

Thank you,
Sam