I don`t use MSE myself, but if you go to 'Start/All Programs/MSE' you may see an 'Uninstall' option; use this.
If not then 'Start/Control Panel/Add or Remove Programs' scroll down to MSE and click on `Uninstall` / 'Remove'. You may be asked to confirm the action if so click 'Yes/OK' and MSE will be removed.
On completion you may be told that some files could not be removed, in this case go into 'C:/Programs' identify the MSE folder and delete it.
These actions will not remove Windows.