congratulation you've just set up folding@home as a service
no system tray icon, no additional effort - just sit back and let the points roll in.
edit: to change max cpu usage you need a shortcut with a -configonly switch (see sticky) but if it's set to idle than theirs no need to change cpu usage on the fly (especially with 2gb of ram) . But in this weather you might want to set it at 50-70% anyway and up it to 100 when we're back in the 20's - all depends on cooling and room temps.