Hi all just wondered what keys I need to use to reboot an acer aspire 5000 to factory settings as I haven't a disk .

I assume you mean rebuild or reinstall the operating system.
Now some brands have a hidden part of the hard drive the contains the recovery image.
Normally this is accessed by pressing F11 while booting your machine.

Worth a try.

Thank you my son will try that and I will let you know how he went,