How to remove a virus when antiviruses not working even if i download another antivirus or any other things the download stops at 98 or 99%?

You should uninstall first of all antivirus, which are already install in your computer, then restart your system, after that you should install a new copy of antivirus, then updates and scan on regular time interval. After doing this you should download "Internet Download Manger", which is really a good downloader, you can download IDM from the following link.... http://www.internetdownloadmanager.com/download.html

You should download antivirus from another PC and install. your problem will be resolved.

While in safe mode with networking you could try and install Malwarebytes Chameleon. https://www.malwarebytes.org/chameleon/

.I got an antivirus from a friend with an USB but it also infected the usb = worm or malware. Are in in India ? home to autorun.inf worm. Can you give us more information like: What is your OS ? How do you know its a virus ? How many antivirus programs on your PC ?

Do you know the name of the virus?

What are the names of the antivirus software that you tried downloading? Where did you download these software?