PC-50 was pre-XP, as is corel 4, so i know 4 wont run on XP YOU GOTA HAVE WIN 95 OR 98. corel 4 was limited to cut to 30" x 30". 7 and up will do 150 ft x 150 ft.
so not only do you have a dinosaur machine, but youre software is so old in aint worth using.
my 1st suggestion would be...COMPUTER...