My autocorrelation attempt - help nedded

So I need some help in coding my own autocorrelation algorithm. The problem I have with the one that comes with LV is that it does not result in a the curve that is expected from my data; ie the resulting autocorrelation is not 'smoothly' exponetional. So to remedy this I have tried to write my own autocorrelation code for the equation I am using. However I am having a bit of trouble in getting this to work. In my last iteration, the code 'worked' - if you call getting zero working! (which I don't).
So any help or advice would be muchly appreciated. I have included the code I have put together, one of the sets of raw data and the equation and related details (as a pdf) all together in a zip file.
So with regards to the data file. It has a bunch of header information (which I remove in the algorithm) and two columns of data. One column is time and the other column is for Intensity. It is the intensity data that I am interested in doing the autocorrelation on.
Attachments:
my Autocorrelation.zip ‏537 KB

Hi scottum,
This is what I got with the algorithm I attached below:
Does this look right to you?
Attachments:
Autocorrelation Algorithm.vi ‏9 KB
my autocorrelation attempt 2.vi ‏71 KB

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