When Windows loads it’s Startup file, it attempts to load every program in there at the same time. Therefore if you have quite a lot of programs starting when Windows starts, each program will try and grab CPU time so that it can load.
If each program tries to do this at the same time, you soon notice the slow down that occurs, due to your CPU trying to help all the programs to load, and your hard disk accessing multiple files.
Startup Delayer allows you to setup how many seconds after Windows has started, to load each program.
Every time I reboot, I have wait for Tokbox, Skype, Live Messenger, and about 10 other things to get out of the way so I can get back to work. Using StartUp Delayer rebooting is now much less frustrating. I definitely recommend you check it out.