What are your system specs (i.e. what hardware do you have)? Are you talking about slow boot process or once you log in and your desktop appears things take a long time to load before you can do anything? If it's the latter one thing you can try is go to start > run > type "msconfig" and hit enter, once the system configuration window appears go to the startup tab and uncheck everything that you don't NEED to run upon startup/login such as auto updater utilities for adobe, java, etc, toolbars, and other stuff