I have a macbook pro, OS V10.9.5; I've downloaded acrobat reader XI for Mac. computer won't read PDF files: says microsoft files no longer supported.  What's going on?  How to fix. RLD

I have a macbook pro w/OS V10.9.5;  I've downloaded acrobat reader XI for mac (I've also installed Micrsort office XI for mac).  PDF files won't open for reading;  videos of granddaughter from daughter's iphone won't play...two separate problems.  Help!  Not very learned about computer semantics and processing functions.

Regarding the USB, see if zapping the PRAM helps.
Regarding your storage space check out the following: 
HD Space Checkers:
Disk Inventory X (FREE)
WhatSize (SHAREWARE)
OmniDiskSweeper (FREE)
GrandPerspective (FREE - donation)
Mac Performance Guide
Slimming your hard drive
===============
Quick fix How To Quickly Free Up Hard Drive Space on Mac OS
http://www.youtube.com/watch?v=fO-mlLApEuk

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