Can't install Microsoft Office Home and student 2007

[Sarantsatsr]

I am having Windows Vista laptop that came with Office Home and student 2007 Trail version. Now as it is almost 2 months, I bought a full version copy and tried to install but my system wont allow me to install the same. It gives me some error and quits the installation wizard.

I thought it could be due to the existence of trial version, hence I tried first uninstalling the trail version and then go for the full version installation. But again a problem here, it wont even allow me to remove the trial version. Any suggestions please ?

[Agilent]

There are few tools launched by Microsoft to fix such problems, some of them are Install and Uninstall troubleshooter program other is Microsoft FxiIt, etc. You can use any such tool for uninstalling if it is not allowing you to remove it from Control panel Add and Remove. So, take a look at this Microsoft Article with tool and manual solutions. This could help you. http://support.microsoft.com/kb/928218/en-us

For more help you can also check this out:
Microsoft Office 2007 Free Trial - Uninstall Issues
Messed up office 2007 trial uninstall, office 2003 not working.
Cannot Uninstall Trial Office 2007 Professional