Intel: Mac OS X 10.4+ ; PPC: Mac OS X 10.5, 1.25GHz PowerPC or Intel processor or faster, 512MB RAM (1GB recommended), 200MB hard disk space, 1024x768 display in 65K colours/16 bits (24+ bits recommended).
Windows:
Windows XP/Vista/Windows 7 32/64, 1GHz Pentium III or better processor, 512MB of RAM (1GB recommended), 200MB of hard disk space, 1024x768 display in 65K colours/16 bits (24+ bits recommended).