Which are the online antivirus programs available? Are the online antivirus tools as effective in removing the viruses?
I don't personally trust online service when it comes for antivirus. It's also means that the people behind the scene can have access to your file because their tool will have to go through all your files. I will recommend to use an anti-virus program running in local and regularly updated.
thanks for the input!
Microsoft Security Essentials and Spybot Search and Destroy. MSE can only be downloaded using IE and is only for XP and above. Spybot monitors the register. For SB: setup a daily schedule for new definitions and weekly for scanning the system by using the advance tool settings located under menu item "mode". MSE will set itself up. It will update daily and scan on Sunday as default settings. As a business of repairing this is what we currently use. Most infections are via free software on the internet, apps on facebook, infected web pages, free music and infected USB memory sticks. Always scan the sticks before using if it has been on another computer.
You should really have an anti-virus program running in the background at all times - I recommend Avira and Microsoft Security Essentials - and only turn to the online scanners in a crisis. They're only good if you are already infected; they won't protect your system.
not very effective but it scan some temp files (if i go bitdefinder is best)
There are many online antivirus, they can remove virus, but some will be removed after restart and others may stay.
What exactly do you mean by online antivirus? Are you referring to cloud based or cloud assisted AV software or are you talking about "in-browser" online scanners for your hard disk?
For cloud based software it depends on the implementation.
If they are assisted by cloud you basically benefit from the fact that any new or modified malware is detected and analyzed by various computers around the world resulting in a faster detection of threads. Some malware can be detected before the AV provider releases an update of the definitions.
For (solely) cloud based software the obvious downside is that they are only effective as long as an internet connection is available. Once offline they may not detect all (or any) malware.
As for "in-browser" scanners I'm not quite sure how good they really are. But I believe the best way is to see them as an additional tool for testing. Much like you could use an on-demand scanner regularly in addition to real-time protection.