How to make our computer free from computer virus without any cost?

          We know that the computer viruses are the most problem creating object in present computer generation. Different people pays high cost and buys different antivirus but we can save our computer from virus attack without any cost. The requirement for the security of our computer are:
1) Kaspersky virus removal tools
2) Avira virus removal tools
3) microsoft malware removal tools

 These are the best tools required for the security of our computer. And these tools should be used in following ways:
1) firstly go in "run" type "msconfig" and click on "startup" and disable every thing which disables every program, virus too which will run automatically when the window starts.
2)then restart computer and press F8 bottom and select "safe mode"
3)now your computer will run in safe mode and insert your portable disk where you have kept those virus removal tools
4)now operate each and every virus removal tools one by one which helps to search and remove viruses from your computer.
5)after scanning with all virus removal tools your computer will be almost totally free form computer viruses and now you can use your computer in smooth way.

Note:You should have latest version of virus removal tools for this process so that latest virus are detected and removed.