Still, hm, this is what I did:
I had xp and 7 installed,
Tried to install Trisquel from USB
Used option: "other/ make own partitions"not "install alongside 7". I choose
mount at "/ " not "/boot"or any of the other options in that drop down menu.
After that Grub failed. All options in the menu failed except "start
Trisquel".
This was the only option not asking for a user and pass. 7 boot menu,
advanced options, edit menu all other options did ask for a user and pass and
after pressing "enter" the only thing happening was that the bootmenu was
displayed.
So, you say it wasn't my choice of " / " as a mount? I have no idea what else
it could be.
Always when I install Linux I can't boot Windows afterwards.
Do you know a bootmanager that will find all OS present and put them in a
menu to boot?
Or do you know where to find a clear instruction on how to manually operate
Grub to add any operating system present?