Were you actually able to get photoshop 5.5 to install by:
Copying the contents from your photoshop 5.5 cd to your desktop.
Then find the Adobe Photoshop folder
Right click on the Setup.exe and click on Run as Administrator
If you got 5.5 to install what happens when you try to start it?
Is your windows 10 a 32 or 64 bit version?
If you go to
Windows 10 32 bit
C:\Program Files\Adobe\Photoshop 5.5
or
Windows 10 64 bit
C:\Program Files (x86)\Adobe\Photoshop 5.5
right click on the Photoshp.exe and click on Run as Administrator, does that make any difference?
If you actually got photoshop 5.5 to install on windows 10, but it still won't start, it may be that you won't be able to get it to work for whatever reason and should consider getting a newer version of photoshop like cs6 or photoshop cc
or maybe even photoshop elements 14 or go back to windows 7