Need dual monitor advice/support

I picked up a used Sony Vaio all-in-one computer from a friend and want to connect my 23 inch Samsung as a dual monitor, the problem is this all-in-one does not have a monitor port for an external hook up. What are my options? Can I connect my 23 inch with an USB adapter? or is there some other option?

Thanks in advance.

http://www.newegg.com/Product/Product.aspx?Item=N82E16812225007

Here is an external USB video card that will work for you. Keep in mind that speed wise USB is much slower than PCI-E and you may experience issues when trying to run video-intensive apps on that extended monitor.

EDIT: I noticed that this adapter only supports 1280 x 1024, you should check your 23in Samsung monitor's native resolution. If you looked at the related items in the link I provided, you can see other USB-Video adapters.