Operating System:
Windows XP, Windows Vista, Windows 7
CPU:
AMD - AthlonXP or newer
Intel - PentiumIV or newer
(recommended - 2Ghz or faster.  Dual core should be at least 1.5Ghz per core.)
(Dual core for BioGraph and NeuroGuide use.  Dual core for EEGer single computer configuration.)
Motherboard:
Must support AGP 2.0 or PCI-express
(NOTE: do not use Windows' generic drivers.  Use drivers supplied by the manufacturer.)
Graphics Card: (more info here)
Graphics card/chip with native support for DirectX 9.0 hardware-accelerated 3D graphics.
(recommended - nVidia or ATI GPUs - NOT Intel GPUs*  (NOTE: using shared memory with AGP may cause problems)
Sound Card:
Any sound card/chip.
(recommended – Creative Labs)
RAM:
512 MB + the operating system's needs
(recommended – more than enough for the operating system to run efficiently.)
Hard Drive Space:
300 MB free space on drive C:
(recommended - depends on the number of CIS Suites installed)

Systems not meeting recommended specs may not be able to use all feedback interfaces, run all CIS Suites, or use the CIS.

* Intel GPUs (Graphics Processing Units) are not recommended for 3D gaming and 3D applications, though they may "work".