Out of memory while expanding memory stream.

Out of memory while expanding memory stream.

This error has occured when I filled up my data table... When it occured,
file length was 22,140,928 bytes. Computer has 128M of RAM and more than 1G
free disk space (on disk where was this file created).

Why is this happening?
Anybody knows where the problem is and what is solution for this?

Thank you for answers!

Iztok R.