su - Authentication failure - reinstall fedora ?

[Angelo Moreschini <mrangelo.fedora@xxxxxxxxx>]

Hi,
after that I installed fedora 20, I am not able to get the login as su.
When I try to sign me as super user, I always get the answer "Authentication failure".

I don't think that I really type wrong the password that I set at install time: I typed it twice.
Rather I think that they are some funny characters inside it.

So I lost the hope to try to guess the password and I think to re install Fedora.., but I have a problem.

My computer is dual boot with Windows XP and I am not sure how uninstall Grub (how to manage the MBR when to the computer start) before to uninstall Fedora...
Some time ago I tried to fix this problem using Windows in recovery mode (command fixboot) and, at last, I had to reinstall also Windows XP (further that Fedora)..

Can I have an advice how  to arrange the dual boot on my computer, before to uninstall Fedora??

Thank you
regards

Angelo

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