Out of memory (failed on request)

Im running a PostgreSQL database (pokerdatabase with HoldemManager) and
trying to vacuum it with pgadmin III, but I keep getting the same error
message (out of memory, detail: Failed on request of size 268435456).

I can read that I should try lower the "working memory", but how do I do
that? I got no skills on databases or postgresql :(

Ive attached a screenshot of the error.

untitled22.png
<http://postgresql.1045698.n5.nabble.com/file/n5801327/untitled22.png>  :




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