Darn man,
I am pretty sure that the solution to your problem is fixing the path.
But since uninstaller is not working again due to the path. I don’t know about a clean uninstall.
Try uninstalling via program and feature → uninstall a program → It should have NVDIA CodeWorksforAndroid.
Also, just for your info. All the downloaded stuff is under the folder I mentioned in step 1. So you should be safe as far as it goes for downloading if you back it up.