You have a good Security setup there
A few things I will add:
1) DO NOT take anything for granted, nothing is 100% secure, the biggest weapon's you have against reinfection is user caution and knowledge. Take notice of all the things that were written in my "How to stay Safe" speech and you will at least have an head start.
2) Keep an eye out for system problems while running SuperAntiSpyware with Avast. Avast has a built in Anti-Spyware feature that does a pretty good job and the two are likely to crash.
As for ViewPoint, its not malicious, but it does come bundled with other programs without the option to remove it. This is considered to be invasive at the least and as it is not needed and will hog system resources, its always good to remove it.
As for Vuze. Thats a P2P (peer2peer/file sharing) program and is more then likely the reason you were infected. Not only is it illegal to download copyrighted material from these programs, it is also a breeding ground for malware.
Please read these links for a more in-depth explanation:http://spywarehammer.com/simplemachinesforum/index.php?topic=110.0http://spywarehammer.com/simplemachinesforum/index.php?topic=5011.0
Hope that answers your questions. If you have any more, please feel free to post back.