A vast number of computers are infected with spyware, and virtually every computer has had spyware on it at some point in its existence. Many computers have lots of spyware programs installed on them and this largely depends on how much security is available and how seriously you take the problem. To delete spyware is absolutely essential and you certainly should not just let it stay there.
Spyware is perhaps the most diverse kind of malware, and indeed the most common. Spyware is often not the most harmful but this entirely depends on how much you have and what type of programs you have been installing.
The typical role of spyware is, as the name suggests, collecting information from the target computer. Typically, this information is just about the websites that you have visited and how long you have been on those websites. While this may not sound particularly severe, it is imperative that you get rid of any software and your computer there was not installed with your consent.
This means that you can have your credit card number stolen or just about anything else that you type into your computer including email passwords and other important password that you use for various websites.
Spyware can slow down your computer dramatically, especially if you have a lot installed. In a worst case scenario, spyware can even come in the form of a sort of key logger which can be extremely harmful since they have the potential to record every keystroke that you write into the computer. This basically means that if you and your credit card number for example, somebody else could have access to it.
Problems caused by spyware tend only to get worse as well. Some of these programmes basically multiply, downloading more spyware and your computer as they are in working. Eventually, you may notice random lockups and the computer will frequently crash or not even start at all.
Thankfully, removing spyware does not tend to be that difficult, especially if you use a reputable program. There are plenty of choices out there that it is imperative that you make sure that you get a genuine spyware removal program as there are some programs which are extremely dangerous which only masquerade as anti spyware programs. However, any genuine program will have plenty of positive reviews all over the Internet to put your mind at ease. One good place to start is NoAdware, an effective programme to delete spyware.