Not clear how to enable PAE

[zipzip6]

I get this error message trying to run an Ubuntu guest on a windows 7 host machine:

A fatal error has occurred during virtual machine execution! The virtual machine will be powered off. Please copy the following error message using the clipboard to help diagnose the problem:

The guest is trying to switch to the PAE mode which is currently disabled by default in VirtualBox. PAE support can be enabled using the VM settings (General/Advanced).

Error ID: PAEmode
Severity: Fatal Error

However, I don't see such option on Setting->General->Advanced.

I'm using VB 4.2.10

Thanks.

[Perryg]

settings -> system -> Processor

[zipzip6]

Works like a charm.
Thanks!