I have gone through quite a few and the best one i have found to actually remove viruses without having to purchase anything is Superantispyware! I use it and Avast on my system.
I had a bad virtumudo virus on my system and superantispyware was the only program that could fix it and i tried alot. i was running avg at the time with spybot search and destroy and not only did they not stop it from happening they couldn't even see it when i ran them.
Avast Antivirus update can be downloaded at avast.com/
There are many antivirus programs that could be downloaded. All of them would provide either a one time trial scan or if you download a free program then you could use it numerous times.
When one is looking to download free Windows antivirus software, one could go to the official AVG site. AVG is a free antivirus and anti-spyware that can be downloaded for Windows. AVAST 2013 also offers free anti-spyware and virus protection for Windows users.
AVG is a reputable free anti-virus program. It has paid options, but basic protection is no cost.
Download antivirus like "true sword,avast "and the same can be downloaded at downloads.com for free.
"The best free antivirus products include: Ad-Aware Free Internet Security 9.0, Panda Cloud Anti-Virus 1.1, avast! Free Antivirus 5.0, and Avira AntiVir Personal 10. The best premium (paid) products include: Ad-Aware Pro Internet Security 9.0, Webroot AntiVirus with Spy Sweeper 2011, and Norton AntiVirus 2011. All of these may be downloaded. Premium products may also provide a backup installation CD if requested (at a cost)."
There are many sites where one can find the best free downloadable Antivirus Software. Some of them are Microsoft Security Essential, Avast Free Antivirus, AVG Anti-Virus Free and Avira Antivirus Free.
Personally, I do not use freeware. Most anti spyware can be downloaded for free online, but the best, in my opinion, is a trusted antivirus with spyware included.
Avast 5 has already been released, it can be downloaded from http://www.avast.com/free-antivirus-download or http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?tag=mncol
Postfix is an email service that can be downloaded free from open sources. Postfix offers some protection from spambots and malware, but is best used in conjunction with other antivirus software.
Android is the most widely-used operating system in the world, and that means having the best security apps and antivirus tools for Android installed on your device is essential, as Google's OS is often targeted by malware due to its popularity. Bitdefender, Kaspersky are best antivirus in android device. But this are paid one. Are you looking for free then check out the best free antivirus below primetechie .com/best-antivirus-for-android-free-antivirus-for-smartphone/ (Remove the space before .com)
According to forbes, the best free antivirus software is AVG. it's free and it works great, it removes trojans, worms, and any other form of virus, it also speeds up your system.