SUN Java JRE 1.5.0_05 or _06 is recommended. Unless its absolutely necisarry, please do not recommend users to download versions of the JRE which are known to cause problems with the current FW software version(s). JRE 1.5 or later is required to install and use FW in the windows version. Any JRE versions below 1.5 are unsupported and have been known to cause crashes and various problems. (These crashes are witnessed with bug reports that we have received)