does virus be the origin of all computer related issues?

Other than system being old, outdated, the only possibility would be virus attack. I can't think of other ways to explain why our documents can't open, documents lost or computer not responding. As everything is software based, it's easy to be infected, no matter how well protected we are. There are no safe system in the world, unless we don't download anything at all?

I think most problems are not caused by viri and the common misconception is due to the severe lack of knowledge that most computers users have on the topic. Problems such as MS word lagging when you paste may not involve a virus at all it could merely be that the computer being used simply does not have sufficient needed to run such applications especially if large blocks of text are being pasted as this Uses a high amount of system resources therefore causing the program to freeze or even crash. I think when it comes to downloading free media it varies on each basis it depends where the software is being downloaded from if it is a highly reputable site with a user community who frequently test software to ensure that it is not infected with malicious software then I do not think viri are a problem however on many sites which host illegal or pirated media viri remain a large problem as most of the software is untested before submission meaning that anyone can submit anything they like without moderation increasing the risk of it containing a virus or malware.

some of tehm yeah so their anti virus can be sell to us, we are as the consument feel losing our money for something that not use, so keep open your eye, just trust the web which have reputable good