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Office 2010 Home & Business Installer error

I have a windows XP 32 Bit PC that had office 2007 Pro installed.
I remove the 2007 from add/remove programs and reboot PC.
I then install 2010 but it detects a previous version of office installed and causes error in attachment.
User generated imageI have tried several fixes including this to no avail:
I have tried Windows Install clean up utility but that just errors when I try and remove the remnants of the program.
I have also tried RevoUninstaller without success - it detects and deletes many registry entries and files/folders but the office installer ALWAYS detects the old version and tries to upgrade it.
Tried to get through to MS Product Support Services - they want a PID for the product which I put in (from another 2010 install that works) and it does not recognise it, and want £46 to speak to me otherwise which I will not pay.

No idea what is stopping this and have had to System Restore back to a few days ago so that the user can continue using office 2007 until I get the fix for this - it almost seems like 2007 just will not be removed from the PC. I really dont want to hear I have to format the PC - that seems ridiculous just to update office, so hope someone has a cast iron fix.

Searched beforehand and found a similar issue but with previous versions of office in this question - have tried the suggestions in there to no avail either.
Microsoft Office

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1) Create a new temp administrator account.
2) Log on and run the installer.

Will this work?
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Proposed solution did not work, nor did any KB article online.
Microsoft Office
Microsoft Office

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

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