How do i set up 4 moniters on my computer?

for awhile now i ve been wishing and dreaming that i can run fsx on 4 screens. and now i have a chance to make it true. but there have been so many hair riping times trying to figure it out. ive seen it every ware! i was told that you can buy a pci and a pci-e card and then they should both work. well so i did and they both don't work one cancels out the other one. then i was told that i can get an eyefinity card but i really don't want to spend $200 for a card when i already paid 150 for two cards. i am really getting annoyed trying to figure it out if anyone out there that know how to get this to work using the cards ive got now. i will be extremely grateful