What is the best free security and clean-up software available on the internet?

I am currently using AVG anti-viral software which seems to be effective. I would like to give my computer a complete overhaul asap

What is the best free security and clean-up software available on the internet?virus removal

Norton 360 works for me.

What is the best free security and clean-up software available on the internet?anti virus protection

Try CCleaner. Free, fixes problems, and cleans up.
GarbageClean service from http://www.SecureMyWindows.com

It is web based and doesn't require installation and it is completely free.
BitDefender Antivirus: http://www.bitdefender.com/no/view/Downl...

Comodo Firewall: http://www.personalfirewall.comodo.com/

Anti adware/spyware/malware: http://www.lavasoft.com/products/ad_awar... http://www.safer-networking.org/en/index... http://superantispyware.com/

CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. http://www.ccleaner.com/

All are free.

Only have one antivirus program and one firewall installed on your computer.

Anti-adware/malware/spyware are ok to have more of.
AVG is good , ADWARE2007 is free also , another really good cleaner is called CCLEANER free and cleans everything
I just keep going round the big company's 90 day free trials, i'm on the norton at the moment it's quite good, give it a go, x