Fixing my site after moving from byethost

Hi!

My issue basically is 404 Errors coming up on almost every page on my wp-admin after i migrated my website from byethost to ipage. I can’t access my plugins, edit pages or posts, it’s a headache. So I did my reasearch and tried changing the Permanent Links, verify my .htaccess was ok, changing wp-admin, wp-content permissions to 755 and nothing’s appearing to work :(. I contacted the support team and they told me it was an issue with the Theme itself and now i don’t know what to do… Any ideas guys? Thanks BIG TIME in advance for the help!

Here’s my website: http://aviacioninec.com/