Hello and welcome to the forum.
Click start and type
msconfig
into the search box and hit enter
Examine the contents of the startup tab and consider beginning with unchecking most of what you see there that is launching at computer startup.
You may want to consider doing a Clean Boot to further diagnose whether there may be other services or such also launching at startup that maybe unnecessary.
http://support.microsoft.com/kb/929135
Regards
Randy