[INVALID] how to de-install i-reboot 1.1.012

I have installed ireboot on a disk Nr 1 contaiing XP, and added a new disk nr 2 with Windows 7. This was to keep the possibility to boot in the 2 environments.
Now, I need no more XP, abd I wish to suppress disk Nr1 but I am unable to boot directly on disk 2 containing W7, how to do this, it is my workin machine, and I prfer not to block it !
Thanks for help


Mostly Harmless
Staff member