Hmm, I can't seem to gain anything from Google either. Only stuff I can seem to find is similar posts complaining they can't find any info on your motherboard

Is your computer a pre-built? If so, what's the manufacturer+model?
Edit: Oh, and like I said, you could try looking at the actual motherboard. If it has PCI-E then it will be labeled as such, like the far left in the image in my post up there ^
Another idea may be to use GPU-Z to see what graphics card you have now, if it's AGP then it's unlikely you have a PCI-e slot.