How to reduce the amount of memory Appian requests?

Trying to run Appian in a sandbox environment. After trying to start Appian EAR on Win7 64-bit (with search server and engines and DB already running) I got an error "Error occurred during initialization of VM / Could not reserve enough space for object heap".

I notice that the search server is requesting "-Xms1024m -Xmx1024m" while the Appian EAR is requesting "-Xms2048m -Xmx4096m". I only have 4GB of RAM total on the VM. Is there a way to reduce the amount of RAM Appian requests?

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