I have a Dell Inspiron 8600 laptop that is running Windows XP (SP3) that I dug out of my attic the other night. It will boots up, lasts about 5 minutes (only for one user account). Then it pops and reboots. I'm try to install Ubuntu 15.10 (32-bit) on it as my new operating system. When I boot from my Ubuntu 15.10 disc (It works) it shows the Ubuntu loading screen then goes and says "WARNING: PAE disabled. Use parameter 'forcepae' to enable at your own risk! This kernel requires the following features not present on the CPU: pae Unable to boot- please use a kernel appropriate for your CPU.' I googled around and it seems pae gives you extra memory. I'm scared to enable this because I dont want to screw my computer up. Should I enable pae?
The generic default kernel (in 12.10 and onwards) already has PAE enabled. Therefore I don't see it as being a risky thing to do. Just grab the most up-to-date version of Ubuntu and enjoy.
According to a commenter, this machine only has 512 MB of RAM available to it. Physical Address Extension is only useful if you have more than 4 GB of RAM