How can i continue to use demos (programs) on my pc after it has expired?

i had anydvd and dvd fab on my pc and the demo version has expired so how can i get past that. when i try 2 down load again my computer knows i had it at 1 point and says that my time has expired. YES i have tryed 2 delete my cookies and that does not work.......................HELP! or maybe you know where i can get it 4 free.