Almost all applications you install want to add a command to startup when Windows loads. If you allow them all to do this, the result will impact system performance. The reason for this is that all of these programs use a portion of the system memory and resources which leaves a smaller percentage for other programs once they are opened. These programs then compete for and use available 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 overall performance. When needed, they can be accessed via Start > Programs or an icon on the desktop.
Windows System Configuration Utility
is one way to check a computer's list of startups but it was not intended to manage the programs that run when Windows starts.
A better alternative is to use a free Startup Manager
like one of the following:
These tools will provide a list of programs that load when Windows starts. If you untick an entry it will no longer run at startup. This will allow you to experiment and see how your system performs with any of them disabled.-- Note: some startup programs are necessary so be careful what you disable.
If you are unsure what any of the program entries are or if they are safe to disable, search the name using one of the following databases which hosts a collection of lists that provide information on the components of legitimate and malicious programs.