If your company gets their desktop computers from a big vendor like Dell, you may find that you have a lot of unneeded autostart programs on your desktops. By removing unneeded autostart programs (programs that start automatically when Windows boots) you can improve the startup time for your desktop computers. Here are two ways to do this:
Run msconfig.exe, select the Startup tab, and clear the checkboxes beside those programs you no longer want to start automatically on startup.
Get the autoruns tool from Sysinternals, which does an even better job than msconfig of ferreting out those pesky autostart programs hidden away in various corners of the Registry.