|Besides the correct above responses there is also PCI-e which is NOT the same as PCI. It is very possible that is what you bought. Trying to insert that into a PCI slot isn't going to work. Of the three different technologies the order is like this. |
PCI, AGP, PCI-e. Pci-e cards usually have a suffix like x8 or x16 after the PCI-e or the word express.