fatal error: Allowed memory size exhausted in includes/theme.inc on line 101

Hi,

My site is down and I need some assistance. I use Go Daddy hosting. Before the site went down I got this error message while making changes to the site:

fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 4069207 bytes) in includes/theme.inc on line 1012.

Line 1012 is includes/theme.inc:
$contents = ob_get_contents(); // Get the contents of the buffer

I am a novice, so pardon me if my questions are not worded with the proper language. Is this a problem associated with the virtual memory that I am allocated since I am on a shared server? In other words, if I was on a dedicated server plan would this error go away? Or do I need to make a change somewhere in a drupal file contained on my site?

Any help is much appreciated.