You should not run it as administrator, that is never good and is not needed, I have run MS/CSP on Windows 7, 8, 8.1 and 10 for many years and I have never ever had any problem so it should work ok.
After uninstalling it, you will still have files in your user directory, make sure they are deleted also before you try to install it again, otherwise it's not much use to uninstall/reinstall, that is where the workspace layout is stored.
After uninstalling it run CCleaner or some other good software that will check your registry if you suspect there is something wrong with it.
Do not install software again without first uninstall it, it will mess up the registry for you.
After you get it working make a backup copy of the configuration files in the user directory
It happens sometimes with my laptop when I go from an external monitor back to the laptop monitor (even though I use an intuous with the laptop). I think it has something to do with the native screen resolutions of the laptop and external monitor being different but I haven't figured out how to prevent it. But sometimes you can make the Touch Operations Small in the Interface settings and force it to go back to normal.
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