Hello Kipu,
that SDK
was just a zip-File, but running the emulator for the first time, created an image-file in your WindowsUser-Folder, like on Vista: "
C:UsersplusminusAppDataLocalAndroid".
Removing Eclipse is not dangerous, because its settings are also saved in a similar folder like above. You should save your workspace of course

. Plugin-Settings normally are saved also to a "safe" folder in your User-Directory, but the Plugins themselves have to be reinstalled.
Starting with Android I made a complete reset of my Eclipse and Plugins, as somehow too many plugins were installed and Eclipse became buggy and laggy. 
Regards,
plusminus
PS: As Eclipse also doesn't really install itself (it also comes within a zip-file) overriding
could be enough, but as perhaps some files remain, where they should not be...