Computers may run slower than usual for many reasons. Here we will try to highlight some of the possible reasons starting with the most common and working our way down a list.

#1. If your computer is fairly new (maximum 2 years old) then the most likely the cause is Spyware, or a virus.

#2. Usually, people are told to install an anti-virus in conjunction with an anti-spyware. This may result in poor performance since every process and file in the computer will be scanned by each program, namely the anti-virus and the anti-spyware. It is recommended that you have both intalled on your computer. However, only run one at a time. This can be a relatively complicated task to achive for someone that is not avid with computers.

#3. System hardware does not meet recommended requirements of the operating system. You should avoid buying a computer with minimum requirements since these computers will usually only run well with the software it came with, adding extra software may slow it down.