Memory Error

Hi, I am receiving the following error trying to complete standardization: 

??? Out of memory. Type HELP MEMORY for your options.

Error in ==> var at 87
    y = sum(abs(x).^2, dim) ./ denom; % abs guarantees a real result

Error in ==> std at 32
y = sqrt(var(varargin{:}));

Error in ==> y_Standardization at 84
Std_AllSub = std(AllVolume)';

Error in ==> DPABI_Standardization>ComputeButton_Callback at 213
[StandardizedBrain, Header] = y_Standardization(ImgCells, MaskFile, MethodType, OutputDir, Suffix);

Error in ==> gui_mainfcn at 96
        feval(varargin{:});

Error in ==> DPABI_Standardization at 42
    gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)DPABI_Standardization('ComputeButton_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

How much memory is required for 25 participants x 6 ROIs x 144 TRs? I have read your suggestions on how to increase the memory however none have been successful (e.g. restarting the computer, only running the required programs, etc.). Do you have any other suggestions on how to overcome this memory error? Our computer is Windows 7 (8GB of RAM) and we are running Matlab v 7.10.0. 
Thanks so much!