Noob cant get plugin started

i was recommended Grasshopper from another rhino tutorial website. i downloaded the standard version v0.5 i think. i installed it then realised that there was a new version, i unistalled 0.5 and installed 0.6 *current build. After first initiallising the plugin (i type 'grasshopper into command line' i get the following error. (i cant remember if this happenend with 0.5 too.)

'An error occured during assembly parsing plugin may not function as expected

mscorlib:exception has been thrown by the target of an invocation

grasshopper: the type initializer for 'grasshopper.kernel.EH_FontServer' threw an exception

system drawing: font 'comic sans ms' does not support style regular'



Also, as attached, the plugin does not have any components in the menu? i dont know if this is an error or standard before file is activated.

please help this ambitious noob
dave

ps, Win XP SP3, Rhino 4.0 SR5b, maxwell render plugin 1.8, panelling plugin (latest)