microsoft office home and student 2007 activation

I uninstalled and reinstalled the product but the same problem ocurred. However, I have since established that he had only used two. I had wondered whether my dad had used all the licenses instead of two. Nothing happened, No Error Message, Nothing. After this I was asked to Activate office 2007 (previously I was unaware that Microsoft products now had to be activated) and so via excel went through options/resources/activate MicrosoftOffice and clicked the button. I installed the software and was able to use it for about 3 weeks before the compatability mode switched on after using a file from office 2000. My father had MS Office Home and Student 2007 (3PC Licenses) and had used 2 of the licenses up and so let me use the last license. Previous MS Office software on this PC: Office 2007 trial (never activated as not used)and MS office 2000 (no validation needed) Also, When I looked for help on Microsoft website it say's that this isn't a Genuine MS product.Hi Please can you help? To start from the beginning (this may take some time) I have since downloaded MS Installer Clean Up to see if that helps, but it seems that no previous versions of Office now exist on the system. I have recently purchased Registry Mechanic to clean up the registries to see if that would help, although it picked up several errors and repaired them the activation problem still exists. Having read a few of the postings and realising that perhaps previous MS office registries may be causing the problem I uninstalled the 2007 Trial version and Office 2000 through uninstall programs as well as un/reinstalling Office 07, but the same problem exists. Went through the usual way to activate and once again Nothing happened, No Error Message. Anyway, I ended up purchasing my own MS Office Home and Student 2007 (3PC Licenses) and installed as normal and straight away was asked to activate Office 2007.

Hi Please can you help? To start from the beginning (this may take some time)

Microsoft office home and student 2007 activation