Okay I've add Threatfire onto his PC.
Here are the list I've put onto his PC and it very light weight.
1. Avast Home Edition free
2. Threatfire free
3. SUPERAntiSpyware Free Edition
4. Malwarebytes' Anti-Malware free
5. SpywareBlaster free
6. Firefox along with NoScript, WOT and Finjan. free
7. CCleaner free
8. Comodo just the firewall the latest free version
And I'll try out threatfire later and thanks for your feedback and your support