It is recommended to back up all data before uninstalling Plesk from your system.
Click on the 'Start' button on the Windows system taskbar. Choose menu item 'Settings', then 'Control Panel'. On the control panel click on the 'Add/Remove programs' shortcut.
Locate Plesk in the list of installed programs. Click 'Remove'
After the Install Shield wizard has removed the program, you may need to restart your system.