What a nuisance. Simple things first - see what programs you have in your start up folder.
Start-run
Type
msconfig
in the box and click 'startup'. If you have printers, office suites, real player, media player, games and other things you do not need to automatically start up, untick them.
If you do not recognise anything in this folder, either google to find out what they are, or leave alone.
Reboot.