I bought a crucial 9600se 128mb video card, but it doesn't fit...?

My agp (yes it's an old computer) slot takes cards with two notches, not one...what can I get that's 128mb?|||did you use crucials scan of pc or the drop downs to choose the pc it is for ? they usually are very good about only telling you what will fit. try going to newegg.com they have large stock and great pricing, i use crucial to confirm what i need then i buy with newegg you may want to just uppgrade the motherboard too or get a refurb pc.|||are you sure you have an AGP video card? i am willing to bet you have a PCI-E video card that has one notch toward the left side of the card when looking at it the way you would install it