Has that happen to me once.. trying to remember how I fixed it.. it was quite a while ago. Lou.

[EDIT] which one is saying it needs to finish install?.. If I remember correctly, the one I had trouble with.. I ended up telling it to install.. then caught it and told it that it was an uninstall.... the ONE time before that, now that I think of it... I restarted the install of the one giving me trouble, then when it was done, uninstalled using something similar to IOBit.. they gadn't invented it yet, lol.

"..... and that was when things got interestiing."