How can I free RAM after running labview vi

 I am trying to acquire 7 channels of data for 60 secs at 44100 Hz using a PCI-6259 card and LabVIEW.  I am using the DAQmx Read polymorphic vi to acquire the data and the 'Write to Spreadsheet File' VI to write it.  When I run the program for the first time, it will acquire and write the data, however when I try to run the program again it says the memory is full when it tries to write the data.  I can close the program and reopen it and it will acquire and write the first time I run the program again, but it will not write the data the second time I try to run it.  I have 3GB of RAM on a Windows XP system.  The data is being acquired as a 2D DBL array and is creating an array that is 2646000x7.  Can someone explain how I might clear the memory without having to exit and reopen the program?  I would also like to increase my sampling frequency to get better resolution. 

Take a look at these threads.
http://sine.ni.com/apps/utf8/niepd_web_display.display_epd4?p_guid=0D91084DF54857D7E0440003BA7CCD71
http://sine.ni.com/apps/utf8/niepd_web_display.display_epd4?p_guid=B45EACE3F12556A4E034080020E74861
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=BDBC351349C011AAE034080020E74861&p_...
http://sine.ni.com/apps/utf8/niepd_web_display.display_epd4?p_guid=BD3FE826C91D23FAE034080020E74861
Do you really have to save DBL data?? could you change it to I32 or smaller?

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