Update graphics drivers? Download new drivers, uninstall the old ones, reinstall the new drivers. 30% of the memory is still only 30%, that's not that big of a deal. Under task manager(ctrl+alt+delete), what is running in the processes tab? Also I'm taking the assumption that these aren't new games and they did at one point have good FPS?
You can also type in msconfig in the search bar in the windows start logo, and change what programs start up when Windows boots up.