Issues with wp-includes

Hi,
Sorry to bother you. This is my site. I have installed DynamiX theme from themeforest.net and all was on the track working good. I don’t really remember since when I’m having issues with files in

/future/wp-includes/js/jquery/jquery.js and /future/wp-includes/js/jquery/ui/

There is no problem with the theme. I even deleted the theme and re-installed it. But no luck. The error as Firebug in Firefox says:

Uncaught ReferenceError: jQuery is not defined jquery.ui.core.min.js:18
Uncaught ReferenceError: jQuery is not defined jquery.ui.widget.min.js:15
Uncaught ReferenceError: jQuery is not defined jquery.ui.tabs.min.js:35
Uncaught ReferenceError: jQuery is not defined jquery.effects.core.min.js:10
Uncaught ReferenceError: jQuery is not defined jquery.ui.accordion.min.js:30
Uncaught TypeError: Object [object Object] has no method ‘tabs’ /future/wp-content/themes/DynamiX/js/dynamix.min.js:2
Uncaught TypeError: Object #<Object> has no method ‘easeInOutCubic’ /future/wp-includes/js/jquery/jquery.js:4

I’m pretty very sure I didn’t do any modifications related to this error as my FileZilla ftp client says no other files are modified either in the theme or the wordpress since installation.
Is there anyone who can show me a way out? I would be so grateful.
Any suggestions is welcomed. Thanks in advance!!