You can upgrade to from older versions of Windows to the latest like XP to Vista but installed programs will probably be removed and need to be reinstalled, and you need to be careful about the stored information on your computer.
P.S. Windows 7 is newer and thus recommended instead of Vista in case you already did not know.
No. Obviously, if you upgrade to Windows Vista, you will have Windows Vista.
Yes, you can upgrade Windows Xp to Windows 7.
You cannot upgrade from XP directly to Windows 7. You must upgrade to Vista first, or perform a new installation.
No
depends on the computer there is a vist upgrade advisor on the Microsoft webpage here is the webpage: http://www.Microsoft.com/windows/windows-vista/get/upgrade-advisor.aspx and that will tell you if your computer is capable of whatever OS of vista you can run
You should buy an upgrade version of Windows Vista however your computer if running XP is likely not to be powerful enough to run windows vista. You should run Microsoft Windows Vista Upgrade Advisor before upgrading as this will show you any problems your computer may have running Vista.
the windows anytime upgrade tool
Assuming it meets the system requirements, yes.
you dont, you upgrade to windows 7, or re-instal xp...
The reason could possibly be that Windows Vista was an upgrade, and had an upgraded firewall. Windows Vista also had Windows Defender installed by default, however, XP required a download for it. Windows Vista also patched several common exploits in Windows XP which were being used in viruses.
windows xp is the only one i know
loads because windows vista is the worst windows software it uses the most ram and CPU Ghz out of all of the windows software i surgest you stay with xp or upgrade to 7