Updating xp home to xp professional

Windows XP machines will be more vulnerable to malware than ever before, and users' personal and financial information will be at greater risk of compromise by identity thieves. Do the dangers of running XP after April 8 warrant upgrading an old PC to a newer version of Windows?Or would it make more sense to simply buy a new computer?Some functions which turned off and disabled via integrated switches which read from registry flag whether it’s Home or Professional edition, such as EFS, RAID support and ability to join domain, may or may not work after migration.Fix Most Windows Errors and Problems With Tweaking.There is really limited protection that people can put into place to protect themselves, because Microsoft won't be patching the [default] browser, Internet Explorer 6, or the OS." Microsoft will be publicizing security holes that get fixed in Windows Vista, 7 and 8.

Windows 7 isn’t the latest, but it’s the most widely used version of Windows and will be supported until January 14, 2020.

If SP3 is in your Control Panel's "Add and Remove Programs" when "Show updates" is checked, then you can uninstall it.

If not, this means that XP was installed from an SP3 boot media, so you need to follow ~quack's advice.

I am trying to upgrade/downgrade to an earlier version of XP Pro Sp2. Yogesh Service Packs are basically one-way installs - they change/modify too many things to be undone safely.

When I try to install, it says cannot upgrade to earlier version. If you do not want SP3 (don't know why, but if) - you need to install an earlier edition of XP (either one with SP2 slipstreamed, or install SP2 on its own).