Click on your operating system click here for info on speeding things up using MSCONFIG amongst others.
One word of warning. If you do alter anything please write down whatever you disable, that way if there is a problem you start in safe mode and retick anything you have disabled. I only mention this because if you untick the wrong box then you could stop windows from running. And if this happens be sure you know how to get into safe mode and be sure you know which ones to retick.