Look under linux image, and/or image headers.....you'll need both. I just built a new tower not to long ago and it runs an AMD Phenom II 3.2 Ghz Core 2 Duo and I have opened up 2 extra cores of which LMDE sees all of them (4 cores) and it runs great. Anyway, go into Synaptic, go to the section on the left, scroll down to "kernel and modules", then in the search window @ the top, type; linux image and it will give you all listings and just look for the one wyroak mentioned....specifically you're looking for linux-image-686-pae.....hope this is helpful.....cheers.
Dell Latitude D810/2.26Ghz Intel/2GB Crucial/250GB WD/nVidia Quadro FX 1400 256MB/Intel Pro Wireless 2200BG
Win7 Bus 32 bit/LMDE-Sid-MATE 32/64 Tracking Sid