When your computer performs slower than usual, you need to be aware of any potential of virus attacks. The annoying sign when the virus infects your PC is the occurrence of a crash and restart by itself more often. Each virus has special form and mode. These viruses are very difficult to be eliminated from each application.
Some corrupted program will affect your machine by forbidding you to install a new antivirus. While, some other make applications and programs on your system disappear without any purpose to delete it.
Computer spyware are programs have the ability to redirect browsers or monitor you keypad activity, therefore gaining a complete access to your virtual identity. Although not malicious in nature, computer spyware could give you a hard time when browsing the Internet.
If you have the choice you should use the auto update option that is provided by most operating systems such as Windows. Free downloadable software from reputable companies such as Avast or AVG Technologues is a good option but they wont offer you as many protection as the bought and licensed antivirus softwares.
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