Fixing locked XP Home OEM after motherboard replacement

I'm repairing an HP Pavilion with XP home SP3 locked to the fried motherboard as a favor to a friend.  My friend insists on XP and wants/needs to preserve the installed programs & data on the drive (which is still good when tested elsewhere).  It has some business radio reprogramming s/w that only runs under XP.  We know he'll need to buy a retail version.  I can't find what really works, says it can be upgraded to XP Pro (which he'd like) but that only covers SP1.  My proposed seller says home can't be upgraded to Pro without a full reinstall and hasn't answered home oem to home retail.  XP Mode under W7 pro isn't an option, if the serial port -> radio timing isn't exactly right the expensive business radios become expensive bricks and he won't risk it like he will with XP on new MB/CPU.  He has current image backups but they're still locked, of course.  The drive passes the vendor's test (in another machine, of course).

Can XP Home SP3 OEM be upgraded to XP Pro SP3 without a reinstall (i.e reformat & install)?  Can XP Home SP3 OEM be "upgraded" to XP Home SP3 Retail without reinstalling?  Is there a better way (keeping XP)  to fix this?



Question Info

Last updated March 30, 2018 Views 4,045 Applies to:

Final result:  After installing the new motherboard the retail XP Pro SP3 install disk would not recognize the installed of XP home SP3, said there wasn't an OS on the partion, and did not offer an upgrade option.  The sofware supplier was right, and the KB article quoted above wrong, at least for SP3->SP3 on this particular configuration.

I then booted off the original hard drive and attempted a phone activation, which failed.  The robovoice said to try updating the license key, which I did using the one on the COA, then trying phone activation again.

That worked.  There's still a few more drivers to dl and install, but the box is working again with a new MB and dual core CPU without a reinstall or OS update.

So despite all the stories about tattooed motherboards and being unable reactivate XP if they're replaced, the actual reactivation was relatively straightforward.

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