I use Linux Ubuntu, but I would like to change to Graphic User Interface (not specific looks like Windows). Are there any opportunities to change the Gnome GUI in Linux Ubuntu?
Alternatively, if you want a more windows like desktop that is pretty highly vetted but isn't as strange as unity, try installing Cinnamon as per these instructions
Also xfce is a bit more windows like and conveniently, pretty light weight so things run faster on slower computers. The fastest way to install it is to open a terminal and run command
sudo apt-get install xubuntu-desktop
If you don't remove your existing desktop environment (no need unless you have to free some storage space) you may need to select the desktop environment once from the login screen.