I tried to install weather gadgets for days, non of them worked. The thing is that I can download and install but nothing is working. Did I did that and why?

To make things worse, than I installed this thing called My weather indicator that is a look-a-like to an HTC gadget, As a matter of fact, I can't uninstall it at all. It is not working, I can't open the gadget, it doesn't show on mu screen, and when I go on Dash to check it out, it shows that it exists, I see a sun and a cloud which is it icon, but it can not be opened or uninstall. There is no uninstall button and the launch button is not working.

I'm new Ubuntu user, I try to learn,and I usually make things work, but for two days it (Ubuntu) is slow, not opening apps at usual pace, and then this thing with not being able to have a weather gadget or being able to uninstall the one I mentioned. Is there a way for me to set things the way they were two days ago?

Any help will be greatly appreciated!