You must ensure you are installing AAX 32-bit or TDM/RTAS versions of plugins. Modern 64-bit-only plugins will not show up.
Accel Core and Process cards (PCIe) or the older PCI-X cards. Avid Pro Tools HD 10
To run Pro Tools 10 as intended, you generally need specific Avid hardware: You must ensure you are installing AAX 32-bit