Administrator Can't Install

I'm using XP home and I have a problem installing somne software.
I want to install Nokia PC suite (although this problam has happened with
other programs) and half way through the installation I get the message:
"Could not open key:
HKEY_CURRENT_USER\Software\Nokia\PCSuite. Verify that you have sufficient
access to that key, or contact your support personnell.'

The account I'm using is the one I set up as an administrator account so,
What am I doing wrong?

I'm sorry if this question has been answered before - I've tried searching
the database and couldn't find it.
--
Only in Silence, The Word