Could you put your Route section of the input file and more error infos? 

Try add SCF=Conventional into your keyword, then the two-electron integrals are stored on disk and read-in each SCF iteration. 

'Write error in NtrEx1'......Looks to me like an I/O error....are you running out of disk space? In my experience, anything with 'NtrErr' is generally relatable to a disk  I/O error of some type. A memory allocation of 1700 MB should be sufficient to handle a substantial molecule (~1000 basis functions or more) if the basis functions are of the 6-31G type.

in the input file their open the main page where u see memory option click on the default button ur molecule will et optimised/use cluster computers. by the way what is the no of molecules ur using and what basis set r u working on. only then i can assist u more.

Thanks all. my gaussian 09 is 32 bit and I think my problem is solved if one of you give me a  64 bit version  for windows.

Dear Saba, I did not understand what you said. please explain more step by step. I' m not expert in computational softwares.

ur deer spelling is incorrect ,

its simple open the menu bar in the g09 software u will see calculate option  in which u will find gaussian calculation set up , then click on link option  u will see memory unit option set that to default plus in the same u will find shared processors option set that to default and submit ur file , ur file will get optmised but it depends on the no of atoms ur working on the more atoms the more time it takes.

it cant be simpler than this 

I worked with g09 revision-A.02 SMP. I didn't find "calculate option" in menu bar. I saw these options in gauss view. 

Is anyone here who can give me the gaussian 64-bit under windows? please help me.

you can use Gaussian 09 under 64bit linux ..... your speed increased on 24 cores. but you need set  up tcp linda and libs. 

Dear Mousavi

Your version of G09 does not support memory more than 1500 MB and you have to use the G09 under Linux for your calculation. If you want please send to me your email adderss to send you this version of G09 program.

I agree with sadegh answer can u specify the atoms used in ur molecule and the no if atoms involved because basis set should also be correct plus increase the no of processors to 14 plus for more details u can mail me the molecule u r working on so that I Cavan see where the problem lies. I hope ur queries is solved

Hello

open this link, may be tit can help you, I do no, what is the version of gaussian 09 you use. I thing that working with  64 bit version of gaussian 09 may resolve your problem

example of 64 bit version: http://www.strath.ac.uk/is/software/gaussianrevc0164-bit/

http://www.chem.ucla.edu/~mccarren/GaussianLargeFiles

good luck for your work

I have recently faced this kind of error, and checked the RAM-processor number and HDD space, but it was still going on. However, i again checked the commands and found the source, and it was the location of the .chk file to be saved, the directory i specified previously didn't exist, so i changed it to another one. So, upto me, it can also be the cause of the error.