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Virus is a computer program that able to spread from one computer to another computer.
They are designed specifically to gain access into parts of your computer system and they have the ability to duplicate and infecting another computer.

Below is some of the most common methods for a computer virus to spread.

Boot Information

Every disk (hard disk, floppy disk, CD, DVD) contains a boot sector even if it is a bootable disk or not.
When you turn on your computer, then it will search for boot information.
If the computer finds a disk containing boot information, it reads the boot information and uses it to start the computer in normal procedure.
For an example if you accidentally boot your computer from a bootable CD that contains a computer virus, that way the computer virus are being triggered and it is possible to be transferred into the computer’s hard drive.

After the boot information on the hard drive has been infected with the virus, it will be loaded into your computer’s memory every time you start your computer. From that memory (RAM) the computer virus infecting every disk that attached with your computer. This is how the infection spreads.

Most boot viruses could stay on a computer system for a long time without generating problems, it was designed only to stay there and spread themselves.
Such computer viruses are designed to activate their bad behaviour on a specific date depends on the creator.
But there are some nasty boot viruses that can destroy the boot information or forcing a complete format of a hard drive right after they are transferred into a computer.

Application Infections

When a computer program that has been infected with a virus is running, the virus is loaded into the RAM.
While the virus is in the RAM, if you are running another application that application can become infected.
It means that more applications on your system are possible to be infected.
Multiple infections are very common and it will definitely generate system problems.

For some time the program files may operates normally without any problems but eventually they will have problems or the infections causes the whole computer system down.

Generally, when an application is infected with a virus, the first sign of an infection is when you are saving files it is saved without a proper names or the data that you save is incomplete.
This type of viruses are often designed to search for a programs that are used to share information between users/computers such as email applications, screen savers, office document Macros, and self-extracting compressed files.

E-Mail Attachments

Most of dangerous viruses are spreading through an e-mail attachments.
In such cases, the user does not realize that they are attaching infected file/s to an email message and send it to a friend/s or colleague/s.
By the time that email is received, the virus is triggered when the attachment file is opened then infecting a new computer.

These days mass mailing email contains worms or viruses are being released.
These kind of attacks AUTOMATICALLY scans your computer’s files and search for any email address it can find and uses your email application to AUTOMATICALLY send infected messages to every email address that it has found in your computer.

It is very important to be aware over the emails that you open. Make sure that it does not contain dangerous viruses.
Even if that email comes from your family or friends, it may contain a virus.
This is the moment where an anti-virus program would be really helpful to detect your incoming messages and to make sure that the messages you receive does not contain a virus.

There are numerous matters that cause a computer to perform slower than before.
It can be from software to hardware.
It can be the storage is too small or not enough RAM.
It can be your BIOS, Operating System Settings or software that are eating up your CPU and RAM.
Or perhaps it can be your network.

Here are numerous tips that can help maintaining your computer perform faster:

1. This is so classic I shouldn’t need to tell it, keep clean which ever email software you use.
I have customers who are constantly complaining, but who will resist dumping years of accumulated emails.

2. Make sure you have a great anti virus program, apply only one anti virus on each computer, make it up to date and auto monitoring.

3. Make sure you use a strong anti spyware program, utilize only one anti spyware along each computer, have it up to date and automatic monitoring.

4. Run Disk Clean Up Daily by following these steps : Start, Pograms, Accessories, System Tools, Disk Clean Up – a box opens – be certain all box is selected, click ‘OK’ – a box pops up – Click Yes).

5. Delete Cookies and Cached Files Periodically by following these steps :
Start, Control Panel, Internet Options, Delete Cookies, Click OK, Click Delete Files – select ‘Delete All Offline Content’ – Click OK, then set your clear history to no more than seven Days – Click OK.

6. A really essential measure almost everyone misses Clean The Prefetch Folder :
Start, My Computer, ‘C’ , Windows, Prefetch Folder, Edit, Select All, File, Delete – Click Yes, Close Windows.

7. Empty Recycle Bin. I believe everyone knows how to empty the recycle bin.

8. Scan drive ‘C’ :
Start, My Computer, Right Click ‘C’, Click Properties at the bottom, Click Tools, Click Check Now.
Be certain both ‘Automatically fix file system errors’ and ‘Scan for and attempt recovery of bad sectors’ are selected, Click Start.

9. Defrag Computer :
Start, software, Accessories, System Tools, Disk Defragmenter, Select ‘C’ Drive, Click Defragment.

The last two steps, step 8 and 9, can take a while if they haven’t been done recently.
I complete this entire routine on my computer before I finish working for the day everyday and the total steps requires no longer than twenty minutes.