This is a Microsoft form post:
It is on the Error code 646.
Basically you will have to do a manual update for your PC.
Also You may want to run a Anti-malware scan. I am Basing that on the fact that you stated 'my Google searches don't always work and I always return to my Google home page'
I notice that you have stated that you have disable your firewalls. You should not have two firewalls installed at any one time. If you are going to use a firewall, pick one and leave the other one off.
HELP! My Sony VAIO laptop is running Vista. I have 7 updates for my Microsoft Office 2003 that keep failing with the error code 646. Is there a fix for this. It is becoming very annoying. In addition my Google searches don't always work and I get returned to my Google home page. Could these items be related? I have already disabled my fire walls for both Windows and my Trend Micro PCcillin. Any help would be appreciated. Thanks to all.