Bit oftopick but its for the bot topic

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What can i do i have 8gb ram 2,4ghz amd phentom 9650 quad processor x4.
I use tiny windows with vmware how much bot's I should run properly? i gave 512 ram but my 6th bot gets bsod's or i get vmware errors(happened one time) can anyone guide me ?

. Maybe i should give vmware more processor cores?.
P.S i use a ds.
P.S.S should i enable Virtualize AMD-V/RVI, Virtualize CPU performance counters.
P.S.S the ds has 1k rpm hdd.
P.S.S.S i use the dxtory thing for 10 fps.
thanks if anyone assists me