HOW TO INSTALL PHOTOSHOP 5.0LE ON WINDOWS7 64BIT?

Greetings, and new here.  Did a search but didn't come up with anything helpful, just a lot of very technical stuff.  I am very simply trying to use an old version of Photoshop 5.0LE that I got with a camera I bought on a new PC with Windows7 Pro 64bit.  I use Photoshop sparingly, but do on occasion and do not wish to purchase anything more elegant as I have no need and not much money.  I appreciate any help you might give.  I have heard there is a process but haven't been able to get it to even open the .exe file to try to install it.  I get a message something like "This version of Photoshop does not work with Windows7," (kinda makes me wonder why I even upgraded the OS since the XP Pro I had on my old machine worked very well with all my programs.

Please help.

Thanks.

Highdesertdweller