i can't open my photoshop

As ​@Trevor.Dennis worte we need more information about your issue and your system.

Please also provide a copy of your 'System Info'. This can be get from the Photoshop menu item Help > System Info. There's a copy button in the System Info dialog. Press this button and paste the info into your next forum post.

You need to provide way more information to have any chance of an answer.

What version of Photoshop are you trying to install?

What operating system and version?

At what stage do you see the error message?

Can you provide a screen shot of those error messages?

Have you successfully installed other versions of Photoshop on the same computer?

What is the computer you are trying to install Photoshop on?

What are its specifications?

Answer the above, and give us any other information that you think might be relevant.  Without that no one can give you any help at all.