Computers are designed to be able to do many things at one time. You can have more than one “window” open; so that you can be playing on Facebook, while paying your credit card bill, and looking for beach houses to rent, while looking for a meatloaf recipe.
The problem is that each time we open a page it takes some of the computer’s attention away from the other pages we had up and running. Each page that is up and running is causing all of the other pages to run a little slower. The same thing happens when you have a computer virus on your computer.
A computer virus, malware, adware, or spyware, is designed to work on your computer while you are doing other things. You may only have one page up and running, but with the virus running in the background your computer slows down because it is actually doing two things at one time.
Virus removal will allow your computer to be performing only the tasks that you assign it and there will be no hidden programs running in the background. The people that set these viruses up to enter your system are very smart. They are crooks, but they are intelligent. They can design their virus so that when you run your antivirus software to remove it there is a doorway left open.
After you have removed the threat they send their virus back through the doorway they created and they go right back to using your computer to perform the tasks they want. It can be hard for the actual location where the virus originated to be discovered because they use other people’s computers to transmit their malicious software.
The best way to prevent this type of thing from happening to you is for you to run your antivirus software scans regularly. At least once a week run a full system scan. If you are a heavy internet browser, or you do a lot of downloading from internet sites, then run a full system scan more frequently.
These scans will help you to catch the perpetrators before they have time to use your machine and your IP address to do their evil work. This can even catch the virus programs that create open doors to let them back in. Generally they do not expect you to run back to back scans, and this can interrupt their pattern.