Is the following a decent security program?

I have Vista with the paid version of AVG Internet Security.I scan and update manually each day.I also have Ad-Aware free version that also I scan once a day.I have System Mechanic 7 that I use about every other day to defragment and optimize my computer.My Windows update is current,and that's about it.I'm very new at this,Is there anything that I should add for additional security??Thankyou for your reply.

Is the following a decent security program?house call

pack.google.com

spyware doctor is included in the pack and is great but uses alot of memory - only use if you have memory to spare

If you have a suspicious file, head over to http://www.virustotal.com and upload it to have several different virus scanners analyze it.

spybot S%26D is a good spyware detector

I have experienced that sys mech 7 uses an awful lot of system resources and quit using it. I don't like it, but that is just my personal opinion.

AVG is great and should work well.

There are several online virus scans. TrendMicro has housecall. While there you might download hijackthis and cwshredder. These two programs are great tools to see if your browser has been hijacked.