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Discussion Starter · #1 ·
I bought Win XP Pro SP 2 OEM and want to upgrade some computers - it will be a major hassle to backup the info. & re-load all the programs: can someone confirm it can be upgraded over the top of Win XP Home without reformatting?
Many thanks.
 

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Some OEM disks will allow you to upgrade, some won't. Put the disk in and see if the option to upgrade is offered.

You do realize you need to purchase a copy of XP Pro for each PC you want to upgrade. You can't use the same Product Key on multiple systems.
 

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Hi,[webquote=http://support.microsoft.com/kb/292607]

Microsoft Windows XP Home Edition:

Windows XP Professional Retail (Full) Version
Windows XP Professional Upgrade Version

Microsoft Windows XP Home Edition with SP1
Windows XP Professional with Service Pack 1 Retail (Full) Version
Windows XP Professional with Service Pack 1 Upgrade Version

Notes:
Microsoft does not support upgrading Windows XP Home Edition with Service Pack 1 (SP1) to Windows XP Professional without SP1.[/webquote]
 

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Discussion Starter · #4 ·
I tried a copy of Win XP Pro SP2 with the new setupp.ini setting of 51882OEM to load. The existing version Win XP Home sp 3 stated "unable to load an older version over existing version...." and blocked the Advanced Installation dropdown. Only a fresh installation was allowed.
Could Win XP Pro SP 3 work? Is there another setting available to allow the Advanced Installation?
 

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If you installed SP3, it may be that you can UNinstall it using it's entry in Add/Remove Programs....

Doing that does not remove the entire SP3, but it should take out enough and the SP2 edition might work.

There are other ways to start the UNinstaller, in case that does not.
 
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