You can change the default menu entry to boot by either going to the
/boot/grub/grub.cfg file and near the top of the file changing the entry: set
default="0" to another number.Count the menuentry lines until...
Luckily on the last reboot I noticed a linux menu with 4-5 option, & one was "Acer eRecovery Management" which did the XP installation all on its own even giving the option to save & install all files & programs.
Made a mess editing boot.ini of my dual-boot Acer Aspire One netbook so that XP boots first & now will not boot in XP, giving error:-
"Windows root>\system32\hal.dll is missing please re-install a copy".