Finder failed to open and now it askes me to restart as soon as I turn it on.

At first My finder would not open, and it kept asking me if I wanted to report the problem. when I restarted it the same thing happend over and over again. then It just started to have problems just logging in it would freeze after I typed in the password. And now It just turns on telling me to restart. when I do It askes again...  what is there I can possibly do now to fix this?

If you don't already have a current backup, back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.
If you use FileVault 2, then before running the Installer you must launch Disk Utility and select the icon of the FileVault boot volume ("Macintosh HD," unless you gave it a different name.) It will be nested below another icon with the same name. Click the Unlock button in the toolbar and enter your login password when prompted. Then quit Disk Utility to be returned to the main screen.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
*The linked support article refers to OS X 10.9 ("Mavericks"), but the procedure is the same for OS X 10.7 ("Lion") and later.

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