Please go to the Apple logo on the upper left of the screen, go to About This Mac (DO NOT Select More Info), and tell me the Version (under Mac OS X), the Processor and the Memory, it is all right there.
Processor: 1.8GHz Intel Core i5
Memory: 8GB 1600 MHz DDR3
Restart the computer then immediately hold the Command key and the letter R key together until you see the Apple Logo. This will boot to the Recovery HD partition. When it boots you will see a window called Utilities, select the Disk Utility and then select Continue. Then in Disk Utility select Macintosh HD in the left column and then select Verify Disk on the right. If that is OK in green type then select Repair Permissions. If it is not ok let me know.
Then after restart open Word and go to Help/ Check for Updates