Windows PE
Windows XP and its predecessors.
Windows Vista was technically the replacement for Windows Xp. However, it was so unpopular that many users simply waited for the release of Windows 7 to upgrade.
Backup and Restore Center
Yes there is, they are different operating systems. VIsta was very unstable, and was replaced by Windows 7 less than two years later.
There is virtually no risk, as no formatting or moving of files is necessary to perform the upgrade. Only certain system components are replaced.
One can find solutions for Windows Vista tweaks online, there are a wide variety of professionals that have opened forums and topics on solving tweaks to speed up the computer/laptop capability.
That edition of Windows Vista does not exist. Windows Vista exists in two editions for home users: Windows Vista Home Basic and Windows Vista Home Premium.
Windows vista requires 512mb of system memory, an 800 mghz processor, 20gb of free hard drive space, and a direct X 9 capable graphics card. Windows vista is the 3rd newest version of Microsoft's OS systems, being replaced only by Windows 7 and 8.
No your windows 7 will not deleted
No. Obviously, if you upgrade to Windows Vista, you will have Windows Vista.
No.
Windows Vista is a Microsoft operating system that has since been replaced by Windows 7 and Windows 8. To find support for this particular operating system, however, one should visit the official Microsoft website.