The IFRM 08P1701/L listed above is a switch. I am assuming you wish to count the number of times it switches on/off and be able to determine its current state. The PCI-6515 and PCI-6514 are industrial 24 V logic DIO boards with 32 inputs. Either of these boards could work well with your switches. To connect the switches to the PCI board the SCB-100 is recommended.
National Instruments supports LabVIEW, Lab Windows/CVI, Visual Basic, and C++. Hopefully the software you wrote is in one of these languages. If so you will be able to interface with the card. For examples, please visit the Developer Zone code library at http://www.ni.com/devzone/dev_exchange/ex_search.htm.