Office XP programs quit immediately after opening

Hi,

I have just installed Office XP Professional and a strange thing happened: the “Windows Installer” box displays and the progress bar fills up and then says “Office XP installed successfully”. It didnt even ask for a serial number or name etc. Thus, when going to open Word or any other office application, it flashes up quickly and then displays the Windows installer box and then quits immediately. This happens within 2 seconds. I have tried uninstalling and reinstalling several times with no luck.

Any ideas appreciated.

Many thanks.

Joe.