Looobylooo is on the right track but from START go to RUN. Type in MSCONFIG, Click OK and then click the STARTUP tab in the next panel.
There will be a lot of programs on the list that you will not recognise so don't remove the tick (to stop them activating at startup) unless you are certain you know what the programs actually do.
You can always Google to find out what they actually do and if they are needed.
If they are not needed every time at startup just remove the tick from the box, they can always be started when required from the shortcut on the desk top.