The 2 white pci slots at the south end of your board would work fine with this card, even if you were running an SLI setup.
Check out this PCI video card:http://www.newegg.com/Product/Product.aspx?Item=N82E16814129042&cm_re=pci_video_card-_-14-129-042-_-Product
Has the notch as well. It's characteristic of the 32-bit universal 3.3V or 5V PCI keying. Won't work in a PCI-e slot. Check out the various keying for PCI (not PCI-E)slots on wikipedia:http://en.wikipedia.org/wiki/File:PCI_Keying.png
My opinion on whether your should use it or not, I say why the heck not take advantage of those standard PCI slots? You probably won't find any other reason to use those PCI slots and they are completely sufficient for the purpose. There are reviews on newegg where people say it works fine in Win 7 64. Get the card. $10 plus free shipping.