Some of my apps won't open now with OS X YOSEMITE upgrade,.

I upgraded to OS X Maverick, then to OS X Yosemite, and now I can't open some of the pre-installed apps. that came with the system.  I'm getting the message: 'You can't use this version of ... with this version of OS X."  PLEASE HELP.  I'm very limited on my knowledge of Macs.    Thank you.

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.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.
*The linked support article refers to OS X 10.10 ("Yosemite"), but the procedure is the same for OS X 10.7 ("Lion") and later.

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