Stonehouse

Evening guys. First time poster, hope you can help. I have two MS Paint files, JPEGs saved to my desktop that are designs for flags. I am looking to increase the size of the image from whatever they are saved to on my desktop, to the size of the flag. Flag 1. 411 x 514, i am wanting this enlarging to fit a 48" x 40" flag Flag 2. 600 x 600, i am wanting this enlarging to fit approx 10ft x 10ft flag. Large i know Can anybody please advise me the best way to do this. A friend of mine did one for me before, and it was basically a number of A4 pieces of paper taped together to make the larger image required, but i haven't got a clue how to do this. Any (quick) advice is immensly appreciated. Cheers guys Regards, Stonehouse