Use the logon tab in 'autoruns' to see what you have running at boot time. You can uncheck things you don't need or stuff you don't recognise. If you find it breaks something you need, go back and recheck it.
http://technet.microsoft.com/en-gb/s.../bb963902.aspx Direct link to the program -
http://download.sysinternals.com/Files/Autoruns.zip