How to get a free trial of McAfee virus protection, without a credit card?

McAfee is offering a free trial 30 day subscription, which I need. When I apply for this they ask me for a credit card number. Years ago when lived in a different place and had a different internet provider I had McAfee virus protection but somebody got my credit card # and stuff and was buying stuff with it, 3 weeks after the first time I ever entered a credit card number on the internet. McAfee failed to stop this happening. Since then I never put my credit car # in the net and I believe anyone who does is stupid. OK, I am going to use McAfee to try to remove a virus that is phucking up my computer now, during the free trial , and I don't plan to buy anything from those ******* at McAfee and will cancel 30 days from now., so how can I get this free item without using a credit card?...........Look I had Comcast internet back then with the Mc Afee. I don't know anyone who believes either of these companies can do anything right, and most of my friends think both companies are sheltered workshops for the devel0pmentally disabled.