There can be a lot of factors that can make a computer run slow. This can be due to an older hardware like the harddrive or processor that is unable to cope with the increased demand of today’s operating systems. Another cause can be malicious or misconfigured programs that consume too much resources. Windows systems tend to build up a lot of clutter over time making it necessary to refresh the system approximately once a year. To determine the exact cause, a thorough investigation of the system is necessary.