Interaction Failings on My Part

I find myself most often working on a PC running Windows7 when at work or at home. There are many, many occasions when I’m trying to click on one application in the task bar, only to find I’ve accidentally clicked the wrong one and launched a hell storm of slow down. As far as I can tell, I have no way to quickly stop and close the inadvertently opened one.

OK, while this is pretty clearly annoying, it isn’t the fault of the UI so much as it is my lack of mouse control–though I wouldn’t mind finding a quick solution for those slow loading Adobe applications.