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"Invalid Product Key" when reinstalling XP Pro

I need to reinstall Windows XP Pro on a Dell PC.  The PC came with XP Home (OEM) then it was upgraded to XP Pro.  My client does not have the XP Pro CD nor the Product Key.  I used Belarc to retrieve the Product Key.  When I used an XP Pro SP2 CD to reinstall the OS, I got "invalid product key".  How do I go about resinstalling XP Pro?
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pbadra
Asked:
pbadra
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1 Solution
 
OlskiCommented:
The key will be for an upgrade and so will not work with a new install from a retail or OEM XP SP2 disk.
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RubenvdLindenCommented:
The used key was most probably an upgrade key, so you cannot reinstall a full version with this key.
I suggest you try to find an upgrade cd.
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SheharyaarSaahilCommented:
that's not gonna work,
you have to use the original product key which came with the xp pro cd, using another key with this cd is nieher allowed nor workable.

or install the OS from the OEM cd and then again upgrade to xp pro using the previous xp pro upgrade cd.
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pbadraAuthor Commented:
RubenvdLinden:  I tryed an XP Pro upgrade CD as well and it still gives me "invalid product key"

SheharyaarSaahil:  I will try your suggestion by loading the OEM cd first then upgrading to XP Pro, I hope I don't get stuck.

Any other suggestions are gladly welcomed.
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OlskiCommented:
It could be a dodgy product key.
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RubenvdLindenCommented:
The product ID is also language dependent. Did you try an upgrade with the same language version as the one that was installed? Also, if you can prove that your client purchased the XP Upgrade, you can call Microsoft for a new key.
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pbadraAuthor Commented:
Olski:  what is a "dodgy" product key?

RubenvdLinden:  Yes, same language.  I don't know if the customer has a proof of purchase.  I believe the purchase was made a few years back.  But, I can check.
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OlskiCommented:
I'm not suggesting that your customer has, but it is possibly an illeagal key from the internet that Microsoft has blocked. Have you tried installing XP Home and then upgrading it? You may also need to do it with a Windows CD that does not have SP2 built in to it and then manually install SP2.
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MereteCommented:
okay to clearly tate this...
 xp home is a full  OS and xp pro is a full OS, not an upgrade.
 They are two separate OS versions
upgrading is like xp  " sp1 to sp2 "
xp home sp1 to xp home sp2, xp pro sp1 to xp pro sp2.

You can't use an xp home key on  an xp pro.  2 different OS.

Now that that is clear to use your words>>The PC came with XP Home (OEM) <<  as its a DEL
Ask them if they deleted the hidden partition as this has the full system recovery inbuilt.
Do they have the recovery discs from the original xp home ?

who decided to install xp pro?
That persom may have believed it was simply an upgrade they would be very wrong.
So if innocently enough  they may have borrowed an xp pro disc  and installed xp pro  over xp home
If  that  xp pro disc is already  used elswhere installed and  activated
 they would have a 30 day grace in which to activate and regester this OS after that it would cease to boot.
Woudl explain invalid disc key.<<<<<

So now your trying to re-install repair xp pro using one of your xp pro discs and the Product Key retrieved  by  Belarc  
I believe on a hunch this maybe the old xp home.
Was there no COA on the rear of the tower?
Ask them if they used this key before?

Solution/s
 restore the orignal xp home using the restore discs if the partition is not gone. You may have to order the recovery discs.
Buy a new key for this xp pro disc he will need a disc . So this disc will now match  the OS installed.

Whose disc xp pro that is?
 know where they got this xp pro from. Someone has a disc that was used here,

Also you'll need to find out if it has ever been used ie  installed elsewhere. Can only be used once unless it is a retail version then you will have to buy a new key from MS.

Slave the hdd and save off any files.

Delete this partition and clean install.
Using a new xp pro sp2 disc. the one that comes with the COA sticker.
If you're not sure please come back with some details  such as which disc was originally used to install xp pro?
Where did they get it from?

Best regards
Merete
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OlskiCommented:
You can upgrade from XP Home to XP Pro but you would need an upgrade disk and to have XP Home installed first to upgrade from. The install code you have extracted may well be an upgrade key and therefore would not install and produce an invalid key error on a full installer of XP Pro.
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pbadraAuthor Commented:
I went ahead and used SheharyaarSaahil suggestion and it worked.  However, I did not have to reinstall XP Home OEM.  I was able to reinstall the OS using the Windows XP Upgrade CD (SP1) with the Product Key extracted from Belarc.  I inserted the XP Pro Upgrade CD into the drive, booted to the CD and started the installation.  The installation found an existing copy of Windows.  I selected "Esc" to install a fresh copy of Windows XP Pro.  The XP Pro upgrade installation accepted the Product Key and after the installation was complete, Windows XP Pro was activated successfully.  I installed all of the Windows updates and SP2.  I now have a clean XP Pro installation.  
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MereteCommented:
Great to hear pbadra I am happy for you.
can't  beat  the wisdom of SheharyaarSaahil  ;)
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