How much RAM are you using? You could try increasing it.
You have a lot of programs loading with Windows that are not required to run at startup for the program to work.
nwiz.exe - allows you to adjust display configuration & settings. It is available via Start -> Settings-> Control Panel or by right-clicking on your Windows Desktop and selecting 'nView Properties'
SOUNDMAN.EXE - the tray icon for the Realtek AC97 Audio Sound Manager. It is available via Start -> Settings-> Control Panel
mmtask.exe - MUSICMATCH Jukebox
mm_tray.exe - MUSICMATCH Jukebox tray icon
realsched.exe - Application Scheduler for RealOne Player.
reader_sl.exe - Speeds up the time it takes to load Adobe Reader
You can try using a startup manager like Starter or Autoruns to disable them and see if that helps. You can re-enable them easily if there is no improvement or you want them to start again.
Download Starter from: http://members.lycos.co.uk/codestuff/products_starter.html
Double-click starter.exe to run or extract the zipped version to its own folder, then go to the Startups Tab and uncheck them.