bluntedd :
but if i try it there is no turning back right? if it doesnt work, will i have to reformat to win 7 ?
Assuming it works, there is a possibility of reverting back. Within 30 days.
Or if it fails partway through, it might revery automagically.
As always, that is not a guarantee. Things happen.
Have a known good image of your current Win 7 before you start.