No Administrative Priviledges

I have a Sony Vaio VGN-A690 and I recently performed a clean install of
Windows Vista Ultimate. The past few days have been spent locating drivers
and installing programs. Shortly after the clean install I intalled two
programs: Norton Internet Security and Trend Micro Anti-Spyware. The versions
I installed were Vista compatible. Now whenever I start up my pc Trend Micro
says that I do not have Administrator priviledges, but when I look under user
accounts it clearly says that I am the administrator since there are no other
users on my pc.

Could you please help me with this issue?

Thanks,