MATLAB: Problem while running a code

errortoo many files open

i m using Matlab 7.8.0(R2009a) in my 64 bit window 7 pc, and i m facing an error while running a (.m) file, it shows the following error(s)
Error in ==> gaunc at 111
Error in ==> ga at 279
Error in ==> allcrossoversc2 at 23
??? C:\Program Files\MATLAB\R2009a\toolbox\matlab\codetools\opentoline.m: Too many files open; check that FILES = 20
in your CONFIG.SYS file.
however the same code is running successfully on a pc having 32bit window xp.
what is the probable cause of this kind of error and what may be the solution for this, can anyone help me and tell me the solution for this or where i c an find the file CONFIG.SYS.
thanks in advance..
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