Where can I watch classic movies online for free, but without downloading?? ( I don't want anything to happen to my laptop)

You might want to try the Internet Archive at link

Also, Hulu at link might have some. Other places to look are link http://www.abc.com and link which mostly have TV shows but might have some classic movies as well. You might be able to find something at Xfinity (if they're still around) or Crackle. You'll have to look those last two up on a search engine, since I don't remember the URLs for those.

Anyhow, that otta get you started. :)

by logging into fanpop

You can find many on YouTube (though I'm not sure about movies starring all those specific stars you listed). I watch great movies on it all the time! Just as great is the site or better VeeHD.com though I do not say much about it here as I don't want to cause it to be taken down. But I would say DO NOT go there if you don't know much about browser plugins. I love to help people so just message me anytime if you want more info. In the meantime here are some samples of great movies on YouTube (Btw, you can find other movies by taking hints from the title of the video and others in the "Suggestion" column):
Pigskin Parade (Judy Garland's first movie)
link Hie0&feature=share&list=PL50000D295F7082E4
Thirty Day Princess (starring Cary Grant and Sylvia Sidney)
link
I could of course go on and on but at the moment I got another job to do so I'll just say if you want you may go to my channel WWIIDDSS and go to my "Motion Pictures" or "Movies to Watch" playlists to find other examples. I hope this helps. Have a pleasant day,
Josh

Just go to google search and type in "viooz" then you can search either the title, actor, or director of the movie you might wanna watch in the search bar. If you want a recommendation, I suggest you type "Thoroughly Modern Millie" in title. I love it, and I think you will too, if you haven't watched it. :)