Out of memory on vacuum analyze

I have a large table (~55 million rows) and I'm trying to create an index
and vacuum analyze it. The index has now been created, but the vacuum
analyze is failing with the following error:

ERROR: out of memory
DETAIL: Failed on request of size 943718400.

I've played with several settings, but I'm not sure what I need to set to
get this to operate. I'm running on a dual Quad core system with 4GB of
memory and Postgresql 8.2.3 on W2K3 Server R2 32bit.

Maintenance_work_mem is 900MB
Max_stack_depth is 3MB
Shared_buffers is 900MB
Temp_buffers is 32MB
Work_mem is 16MB
Max_fsm_pages is 204800
Max_connections is 50

Any help would be greatly appreciated.

Thanks,

John Cole

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