@priya_g Sorry for the delay in reply! It is best to start a new topic if your issue is not exactly the same as an existing topic. I have split your post to its own topic now, to keep things organized.
I am guessing the issue you describe is caused by attempting to launch Fiji from inside a temporary folder. When you download and double-click a ZIP file, and double-click that ZIP file, it opens a “synthetic” folder that has not actually unpacked all the contents. If you try to launch an EXE from such a folder, things often go wrong.
Try right-clicking the ZIP and extracting it to a folder on your Desktop. Then open that extracted folder, and run from there.