... can not see? For the problem like this, people have made those anti-virus programs to find the virus, I strongly recommend you to have an anti-virus program, because you may never know what it actually in the file you are looking. In a PC, if a virus gets in, it will begin to spread it self, and do damage to it. Can we stop it? Yes, virus has always been a big problem to PCs, and there are many solutions as well, it's just whether people actually do it or not. We can like have regular whole system virus scan e.g. every week. We can also use the floppy disk or CD-ROM that you trust, but even if you trust the source of it, you will still need to have a virus scan before you open it. Be careful with all the files that you have downloaded from the internet, ...

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