Go to https://imagej.nih.gov/ij/
How to download and install ImageJ without Java. This is for computers that have Java already installed.
Download ONLY the version without Java, "Platform Independent" and save to your download folder. Extract the .zip files to your My Documents or Documents folder. Locate the ImageJ folder, open the folder and find "ImageJ.exe" program, make a shortcut of the program on your desktop. Open ImageJ from the desktop shortcut.