Boot question

My laptop came with windows vista in C:
I installed win 7 in H:

I currently can choose what to boot when i start the laptop.

What if i format C: while using windows 7 ? While the boot have trouble? (i think that the boot file is in C: or am i wrong?)

What should i do?

Be careful ... back up before you try ANYTING anyone recommends

This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.