[R] R Memory Problem

[prem_R]

Is anyone could help me to resolve this problem?I'm presently an SAS user for
my application and was exploring R to use it for my application.I have
already posted this question on using my 32 bit machine with 2GB RAM and
from what i understood was to use a 64Bit machine .I tried using 64bit
machine using 4GB RAM .I'm running predictive analytics using R and to
calibrate my model i used to adjust the variables used in the model and the
problem happens here.R just runs out of memory .I tried garbage cleaning
also.
data 
APN    condition    quality    site_zip   sale_date    sale_price     
estimate     
1.1-1   good         good       10201    1/1/07         $234,000     
$254,000    
1.5-1   average     good       10201    1/1/08         $254,000     
$276,000      
1.6-1    poor          poor       10202    1/1/06         $192,000     
$199,000
1.7-1    good         good        10202    1/1/07        $300,000     
$305,000

Regression equation 

Sale_price=condition quality site_zip 

after running the above equation i will be getting the estimates and 
then i will calibrate the model using the dependent variables.

For that purpose seperate dataset are created and run for 50 Iterations
.Problem occurs here after running few iterations it shows out of space.

I'm using R 2.10.0

If you need any other clarifications i shall provide the needed .Help me to
solve this
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