no
Answer: If you going repaire windows. first take email backup with address book.
Use system restore, failing that reinstall M.E.
You might. Back up the My Games folder (located in My Documents). Uninstall, reinstall, and paste the folder back.
No. In order for it to be "another C: drive", it would have to be on a completely different computer.
I am unsure of the names but I can remember what each one does. The first one should merely reinstall windows but leave all your files where they currently are. The second one should move the current structure of your hard drive to a folder normally entitled something along the lines of "my old disk structure". It will then reinstall windows on your hard drive. The third option should completely wipe your hard drive and reinstall windows on it. If you have any files that aren't backed up then you will lose them. Dont use this option if you have any files on the computer when you use this option you will lose them!
If you have not used disk imaging / cloning software to transfer it to the new drive, yes. You can still reinstall with the disc, however.
yes. it will save your files.
If you do a clean install, yes. Everything is lost, and you end up with what would be considered a clean, out-of-the-box PC. If you, however, do an upgrade, everything is transferred over.
It depends. are you re-installing it from a disc?
It is to lose
Yes. Since the games are build into the Steam platform, you will lose them. Although, If you purchased a game, you can get if again for free if you Reinstall it.
Yes, when you "reformat" it erases the hard drive completely. It will be an empty drive, you will have to reinstall the OS from your disk/Apple internet or reinstall from a back-up after you do it.