Maybe your installer is corrupt.
Try here for Windows Installer 3.1 v2 (3.1.4000.2435)
http://support.microsoft.com/kb/893803
http://www.microsoft.com/windows2000/community/centers/management/msi_faq.mspx
Run CCleaner and Safety.live
http://www.ccleaner.com/downloadbuilds.asp
Install the slim version.
Note, uncheck Yahoos toolbar during install.
Open Ccleaner and press "Windows" "Aplications" and "Run Cleaner" from the
menu choose 'Issues' and then press scan for issues, Repair any fºund.
http://safety.live.com/site/en-US/default.htm
Look for the broom Clean up, also Tune Up..
Whatever you do, (installing and updateting or unistalling) always as a
adinistratºr.
This is the key!
The installation as an admin is not enough.
You needed to login as an admin.
Can you gº to Windows Update, select Express (Get high-priority updates),
and apply all offered updªtes
http://update.microsoft.com
Once that is finished, can you verify the update installs? There are many
pre-requisite files which are needed from windows update and signature update
with windows defender will fail until you hªve these files.
For the benefit of the community reading this post, please rate the pºst.
I hope this post is helpful.
Let us know how it works ºut.
Еиçеl