That doesn't really affect your rights: You still own the program, you may still use the program, and you may even still sue the software vendor if the program doesn't work as expected.
What the disclaimer is supposed to achieve is state that there was no contractual obligation to deliver a piece of working software. For software distributed free of charge, this might be viable, but I would find it rather surprising if such an obligation wasn't automatically implied to at least some degree by any commercial sale.
But this is above my pay grade as I'm not a legal professional or even amateur, for that matter.
