Put this on the motherboard:

http://ca.startech.com/Cards-Adapters/Slot-Extension/PCI-to-PCI-Express-Adapter-Card~PCI1PEX1

Then stick your mPCI-E card in here:

http://ca.startech.com/Cards-Adapters/Slot-Extension/PCI-Express-to-Mini-PCI-Express-Card-Adapter~PEX2MPEX

Now, your card is half size so you want either this:

http://ca.startech.com/Cards-Adapters/Slot-Extension/Half-Size-to-Full-Size-Mini-PCI-Express-Adapter~HMPEXADP

Or you want to be silly and follow my reckless path like this:

http://www.poopr.org/images/90zeqhxk7dpkeck3l9w.jpg

Yes, a paperclip. :/ But it does work and is sturdier than it looks.

Or, you could, you know, use a PCI ethernet card. Or a PCI wireless card. Or a USB ethernet or wireless card.