R problem

I'm using R version 2.12.0

I'm trying to open a stata file (.dta); but I keep getting the message:

Error in read.dta("c:/p4subset_biology.dta") :
Calloc could not allocate (-603966867 of 4) memory

What does this mean?

The file should contain lots of physiological data. 

Thank you for your help.

-Bruce