If your system is slow, you may have too many applications loading
when Windows boots. Almost all applications you install want to startup when Windows loads. If you allow all these startups, they will compete for and use system resources resulting in poor performance and a slow system. Many of these programs are not needed and disabling them can save resources and improve performance as they are available from the Start Menu > All Programs or an icon on the Desktop if needed. Other reasons for Slowness, freezing and performance issues include disk fragmentation, disk errors, corrupt system files, unnecessary services running, too many browser Add-ons/toolbars, failure to clear browser cache, not enough RAM, dirty hardware components, etc. Incompatible browser extensions and add-ons can impact system performance and cause compatibility issues such as application hangs (freezing).
As you use your system it becomes filled with more files/programs and has a natural tendency to slow down and behave oddly so cleaning and regular maintenance is essential. For more information about trimming down the number of startup applications, please refer to Slow Computer/Browser? Check here first; it may not be malware
. Scroll down to the section titled " Check for any unnecessary applications loading when Windows Boots
" and use a Startup Manager.