how to cleanly uninstall Ubuntu 10.04 and remove grub2

[Abhishek Dixit]

Hi,
this question is important for me to know.It is not a regular support
question of using Ubuntu.
My problem is I have to do some computing resource intensive work for
a couple of days
and I have borrowed laptop of a friend for this work.For some training
and demo purposes.
(I won't be using Live CD or PXE boot sort of things)

Which is Lenovo Y560 http://shop.lenovo.com/us/notebooks/ideapad/y-series/y560
the laptop in third column on above link 8GB RAM.I will install Ubuntu
with Wubi installer in a folder.
The problem is these days laptops come with Windows 7 pre installed so
I wont be doing any partitioning etc.
My concern is when I will return it then is there any option to
cleanly uninstall Ubuntu.
I remember a long long time back when I was a Linux guy I used to
insert XP cd and from the recovery console
commands like fixmbr or fixboot used to work and I used to get the
Windows bootloader without any Linux thing back.That time I used to
just wipe out
installed Linux by formatting the Linux partition from within Windows
drives (right click and format the Linux drive to an NTFS partition)

Since it is not my laptop and the guy has given me trusting so I would
like to make sure that before I go ahead with my work
I return him in clean state.Other wise I will not use it.So un
istallation is important for me to know.
Let me know if some one has experience on this part.


-- 
Regards
Abhi