Remember the fact you have two operating systems each on separate partition. Let's assume that Windows 7 is latest installed operating system. It means that Windows 7 is taking care of booting Windows. There will be two steps you need to do.
First one, you should move all your important data from partition where Windows Vista is installed. After moving your data you should format the partition with Windows Vista. NOTICE:By doing this you are going to wipe all the information on this disk. Windows 7 might not allow you to perform partition formatting because there is another Windows installed, I suggest using Windows DVD to perform formatting.
Second one, when booting Windows 7 still might (mostly) show you Windows Vista/Windows 7 select screen. This is because booting information is located in Windows 7, this is your primary operating system and it takes care of booting Windows. Now we are going to modify boot information.
No. Vista ruins all windows(non-vista) and RAIDed partitions.
Sometimes before to install vista you have to delete all partitions on your hard drive. Such brand like HP, Dell and so on have special restore partitions on theis laptops and desktops. Also these special partitions protect MBR sector from viruses. To install vista you have to delete such partition(s).
Yes Partition Your Hard drive into 2 "partitions" and it will Dual Boot. See: http://www.pcworld.com/article/73826/stepbystep_partition_your_hard_drive.html
You cannot reformat a hard drive and keep operating system(s) untouched. The point of formatting is to erase all data. There is only one exception, you can reformat some partitions on your hard drive if you have any. If you want to keep your current operating system those partitions must not be system.
To do that, you need to create two separate partitions on your hard drive and choose a free partition during the OS installations.
Any type of Flash drive can be used in Windows Vista.
The Windows Vista technology that supports a hybrid drive is called ReadyDrive.
There are several tutorials on YouTube which will show you exactly how to remove a partition. Removing a hard drive partition on Windows Vista will create an empty space that you can use to install a new partition. Be aware that it will also delete all data that is on the partition.
none
GParted tool or partition manager.
open CD drive insert windows vista disk and run it
You cannot reverse such process especially after you have installed the os. But if you remember the old partition size you can format the disk again, delete partitions which you don't need and create a partition which you want to have.