In order:
2. You don't want one. PCI is a legacy slot architecture. It is gradually being replaced with PCI Express, which isn't compatible with existing PCI cards.
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PCI express is backwards compatible with PCI. As of now PCI-e is replacing AGP not PCI. PCI will be around for a while. Kind of like the floppy drive. It just will not go away.
Now what do you mean by problems. Like you couldnt figure it out or it just didnt work on your system. If it was that you couldnt figure it out most likely you will have the same problem with any other card. but still with firewire and USB 2 audio interfaces you have more to choose from. theres not as many PCI cards as there are Firewire and usb. and you can also hook it up to a laptop if it has firewire.