http://www.hardware-one.com/reviews/iwillbd133/images/pci_t.jpg
That's a set of 6 perfectly normal cream coloured PCI slots on a motherboard.
The wee brown slot on the left is a CNR modem riser slot and is used by oooo exactly zero pieces of gear so don't worry about it.
The other brown one on the right that's also set back a little is the AGP slot for the graphics card.
You might have an AGP slot but there might be nothing in it.
If there is no card in the AGP slot you have on-board graphics.
Don't worry about that either.
The PCI slots are the cream ones.
When you put the card in make sure it's all the way in and that the metal backplane is screwed down.
There'll be a blanking plate in the PC chassis that you'll have to take out to get the card to fit properly.
When you're putting it in press down firmly but not ridiculously hard.
It should go in nicely but it won't be as easy as you think it should be so be firm.
Any hassle get back to us and we'll take care of it.