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It sounds like your computer simply does not have enough memory to grid the data. You can estimate how much RAM you will need (in bytes) by multiplying the number of data points you have by 400. Surfer 8 requires up to 400 bytes of memory for each XYZ data point when gridding.

There are some things you can do to try and work around the problem:

1. Try a different gridding method.Some gridding methods require more memory than others. For example, Triangulation with Linear Interpolation requires up to four times the amount of memory as Kriging.

2. You may be able to change the search options to reduce memory requirements. The default search of 64 points from four quadrants may be more points than needed. We've had good luck with as little as 2 points per quadrant.

3. Reboot the computer. Surfer also requires a contiguous block of memory for operations, so some operations may fail if memory has become fragmented into smaller blocks. I suggest rebooting the computer, closing down all other applications that start during boot up, and then try gridding the data.

4. Go to File | Preferences (Surfer 8) or Tools | Options | General (Surfer 9) and set the Undo Levels to 0. This will not allow you to Undo any operation, but may free up some memory. Once you grid the data, you can set the Undo level back to a higher number.

5. Open the data file in the Surfer worksheet. Highlight all the data and go to Data | Sort and sort the data first on X and then Y values. Resave the data and close it. Sorting the data prior to gridding saves memory when opening the data for gridding.

6. Divide the data into smaller files. Grid each file separately and then combine the grid files using Grid | Mosaic into a single grid file.