Hi Shane,
Glad to see you removed the extra anti-virus program. Running two on the same computer can actually compromise your anti-virus protection because both programs will battle each other and often times let something in that shouldn't be there. Now I don't see a firewall running on your system, unless you are running the built in Windows Firewall, which isn't picked up by the HJT scan. If you are not running a firewall...and the "one to a computer" rule applies here too...then go to this link

PROTECT YOURSELF FROM MALWARE: Tools & Tips

and download one of the good free ones that PP notes in the thread.

Your log looks good, except for a few programs running unnecessarily at Start up that can easily be run manually if needed. If you want this list I will post it later.

Now for the Windows Installer problem. Have found this info on how to disable it. I won't print it all here, just go to THIS LINK to learn about it and how to use it. Looks pretty simple and straightforward to me. Just be certain to read all the instructions. Note in the link they use the FAX related problem as an example but you will look for the Microsoft Office program in the list. If it will be easier to follow the instructions I would advise printing out the instructions. Here, then, is the link for downloading the

Windows Installer Cleanup Utility

Just scroll about 1/3 of the way down to download the utility. Then just follow the directions.
Run the utility and see if it corrects the problem.
Judy