installation issues with mod_rewrite

I got this error
"Installation Error
Before installation can continue, the following errors must be resolved:
mod_rewrite is not enabled
Apache's mod_rewrite extension must be enabled for Omeka to work properly. Please enable mod_rewrite and try again."

I read the other posts and tried changing to uppercase "rewrite Engine ON" in my .htaccess file and uploaded it, but to no avail. Any ideas?

If mod_rewrite is not already enabled, you must change the setting on your server. Here's another forum post that includes instructions for the changes you'll need to make: