Here is one important thing that you should also remember that not all computer problems are caused by viruses. Even though your computer, or a particular program, may not be running properly, this could be caused by other things, such as a bug (which is simply an error in the application’s code), or misconfiguration of software or hardware. Contact the software or hardware vendor to see if they are aware of any issues and if they can help.

This are some list that could be a caused by the slowing down of your PC that could be causing failures that enables computer security threats what we usually know is the VIRUS. A “generic” computer virus is a small program that attaches itself to another program or document, such as a word processing document, and replicates it with the potential to cause damage to your computer. A more common type of virus is one that “invades” your email program and spreads to contacts in your address book.

Another thing could be WORMS. This type of virus is specifically engineered to make extensive use of email and security holes in software or operating systems to spread rapidly.

You can also count in TROJANS. This is a type of program that pretends to be something harmless, but has a damaging or otherwise malicious intent. For example, a person may get a program by email or the Internet that he or she thinks is a computer game; however, when the person runs the supposed game, the program deletes files on the computer or injects viruses.

Computer security threats can be solved using antivirus. This three common programs that are capable of infecting Operating systems especially Windows are harmful especially when you have thousands of files in your computer. With one click everything can be infected. We can prevent these things from happening by using antivirus and keep it up to date. One great antivirus I am using for quite some time and works fine is the ESET NOD32.