Alright. I'm finding very little info on your computer/motherboard online. It seems Packard Bell has removed all info about the product from their site as far as I can tell. What I have found out is that you have a Orion MS-7168 motherboard but I can't find the specifications of that board. What you should do is download CPU-Z;http://www.cpuid.com/softwares/cpu-z.html
On the mainboard tab it should tell you your Graphic interface so we can know what kind of cards your board can handle. I believe it actually has a PCI-E x16 slot which is good but there's no concrete info confirming that.