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One way to secure a file on your computer is to protect it with a password. Other ways to protect personal files is to encrypt them or editing permission settings on your computer.
To avoid Computer Viruses to protect one computer to another computer.
A computer's anti-virus software has a firewall in order to protect your computer from online/infected files that can contain viruses.
from my research AVG only downloads antivirus files onto your computer to protect your computer form spyware, viruses, and any other thing that might harm your computer.
Use a removeable Flash drive to back up your files
So other people cannot delete your work and change whats on your computer.
There are many encryption software that can allow you to protect your files and documents by creating a password. You can easily download this software by the search results and protect your data from theft or hacked even this will also allow to get permanently deleted files which are not easily deletable.
VIRUS
when in one computer modify that file it will not be updated in all the other computers it affects the data integrity. User may not know which file is having the latest information. I have synchronizing or organising tool to over come this issue.
Yes! It's true.
Record all your files through your CD ROM on a DVD-RW, using UDF system so that you can modify, erase or record new files. (Just drag the files onto the CD-ROM folder.
the reasons why it is important to download files on your computer