There are various reasons you need to contact the avg technical support phone number. This is usually when you are plagued with a virus, Trojan, worm, adware, crapware or even ransomware. What one should however be aware of is that it is advisable to have the protection already installed rather than to go hunting for the AVG Phone Number when one is the subject of an attack. Infact the chances of the avg support phone number being of help at that time is reduced as compared to them being able to help as a precautionary measure.
The reason why you would need an antivirus is that, if a website sees that there is a security flaw in the browser or there is a plug in like flash which is enabled, the computer is recognized as being compromised. This in turn results in an attempt for installation of key loggers, rootkits, Trojans or other kinds of malware.
The malware also uses computers as botnets or even to get financial information. An antivirus however, is a layer of defense. This increases the likelihood of the malware being caught and quarantined before any real damage can be done. This however should not be the only layer of protection that is used. One should also be careful while browsing.
People feel that antivirus software slows the computer and is heavy. Some of these programs do so but the recent antivirus software which are available are much better. They are lighter when it comes to using resources and they do not have junkware. They also do their job extremely efficiently and effectively.
As a precaution as well, you need to be sure about which files are being downloaded as well as run and the software needs to be constantly updated. Any software which is vulnerable should be uninstalled.