How can i built/make my own antivirus software for free?

how can i built/make my own antivirus software for free?

must read!!

please read this full info.

i have avg free malwarebytes free pc tool firewall. please help me in making a setup of these software by wich whenever i click on my setup all the following software install automatically without install a single softwaye at a time.

please help me in making a setup of these softwares..please help me
antivirus/spyware removal:

http://merakit-komputer.com

http://merakit-komputer.com
Google it.

you can use visual basic for this setup making.

farooq