Bounce rates are generally high, although the type of website makes a big difference e.g. bounce rates for blogs are higher than normal.
If you're bouncing at 65% or over you probably have an issue. Some experts say a bounce rate of 25-45% is pretty good.
How to reduce the bounce depends on a variety of things but how and where you're marketing the site would be major contributors.
A bounce is almost always because the initial content the user see doesn't match what they were looking for so is your search engine blurb or ad accurate to your content?
Do you make the content of the page easily identifable?
You may need to alter your landng pages to better keep visitors or work on your ad words and marketing channels so the users seeing are your ads and links are already the right market segment for your site.