If you like I did purchased the Samsung R519 laptop from argos, it was on offer with a free bag and mouse.
You was more than likely mislead and entitled to a refund.
The item description in the catalogue and online said it comes with a free 3year pre-registered warranty from the manufacturer. This is infact incorrect. If you contact Samsung they wont have any idea what your talking about.
You need to get back in touch with argos and inform them of the mistake, if they argue tell me to look in the spring/summer 2010 catalogue, it states 3 year pre-registered warranty.
This doesnt have to be registered.
Here is the advertisment on HOT UK Deals http://www.hotukdeals.com/deals/samsung-r519-laptop-pentium-dual-co/650600