I told you once how to remove startup programs to speed up your computer but it can get annoying having to that over and over each time you install something new.
WinPartol 2007 is free and will fix this problem. WinPartol is available in a paid PLUS version that includes other stuff but it is not needed for what I am about to tell you. The free version will not only manage startup programs, but it will tell you when a new program adds itself to try to start up. This way, any time you add new software, WinPatrol will alert you if it tries to start when your computer starts. If you like WinPatrol, I suggest you pay for the full version.
You can get WinPartol here