Vista - Not enough storage is available to process this command

I got a script from someone to 1) find all mail-enabled groups and 2) list
all the members. I modified the script so it will list members one for each
line in the list. It ran and found proper groups and listed members as
expected. But after reaching 187 groups it generated following error and
aborted the process and no output file was generated:

c:\temp\listDistGroups4.vbs(125, 13) (null): Not enough storage is available
to process this command.

without modification of the output format it worked fine. Any idea what can
I do to fix the error? I can post the script if necessary.

Thanks.