I was trying to install Windows 2003 R2 on my machine (2.8Ghz, 1GB RAM, 80GB Disk) when I came across this wornderful error

It says “Out of Virtual Memory” 🙂
On a blank machine, before the installation is complete 😀

And the best part, the memory is so low for it to display a proper message on the message box
Have a closer view to the message box