Depending on what is wrong with the installation, probably not. Many files in Linux require a certain set of permissions to be set on them, or else the users and daemons can't do their jobs correctly, and the users will be unable to fix the problem even if the system boots, because they won't have permission to do so.
The reason that this is an issue is because all the software that allows Vista to read various Linux file systems (such as ext2 or ReiserFS) doesn't support Linux-style permissions and thus all files that are created or modified belong to the root account.
Vista Home Premium : Not Linux! Get linux! Vista Business : Not Linux! Get linux!
Yes. Doing so isn't particularly difficult, and most Linux installation discs can guide you through the process.
Get Linux!
windows xp ,linux,vista
nothing
Yes by buying a window vista installation CD.
yes
Yes
HCL
There is no "the" operating system. There are LOTS of different ones available. Windows XP, Windows Vista Linux Mac OSX and much more... There is no "the" operating system. There are LOTS of different ones available. Windows XP, Windows Vista Linux Mac OSX and much more...
Get Linux
It depends on what edition you have and what you enable, but my Vista installation (Vista Home Premium) took 10GB of space.