PCI Express (or PCIE) is better than PCI. Since your system/motherboard has integrated graphics, a dedicated PCIE graphics card would be a great improvement (depending on your choice of upgrade). If you're not a gamer, then a graphics card upgrade (from the present one) will be unnecessary.
This is your motherboard: click here, & its connectors/interfaces: click here. As you can see it has a PCIE slot, so you should be able to upgrade to a PCIE graphics card. If you do, remember to disable the onboard grapics in the BIOS.
Before you go ahead with the upgrade, please:
1. Let someone else confirm that you CAN, or better still contact Packard Bell support click here.
2. Make sure that installing your own hardware (in this case a graphics card) doesn't invalidate the Imedia's warranty. Some warranty info click here.
To contact Packard Bell support directly to enquire about both of the above click here. G