Just wanted to add to this post.If you buy a "half size" PCI card, adapters are available on eBay for ~$3-4 and they will allow you to fit your half-size card in a full size slot.
Here's a link to one I've been using (works great!): http://www.ebay.com/itm/331161237621?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 Hopefully the info is helpful to somebody!
