Smith,
Sorry that you are seeing this issue.
Can you please check if you can run the MyEclipse uninstaller from the Windows start menu (or equivalent in other systems, will usually have an entry for the uninstaller) or run the “one-uninstall” executable located in the folder named “Uninstaller” under the MyEclipse installation folder ?
If the above methods fail for some reason, then please manually uninstall MyEclipse. Here is an FAQ for manually uninstalling MyEclipse.
Let us know how it works for you.