Futuristic PC's

In the future I would like to imagine a world where computers never crash. Virus' are such a hassle and with all these new programs that are developing I could forsee a new software that REALLY does help protect our computers. Not only would I like to see that, but I would also like to see more free downloads that can honestly be useful. I feel companies dont give enough free trials of softwares, and it could be really nice to try something for maybe 90 days and then having to purchase it to own it. Im not saying all companies dont do that now, Im just saying not enough of them do it.