I started having having issues when off my imac

Hi everybody my name is agustin. I'm a new owner of an 21.5 inch 2011 iMac with 500gb. I have been using it for about a month without any problem and i was incredibly satisfied with the product i bought till now. Well actually I stil am satisfied but I am having an iimportant issue i think.
Well let me explain: everything started with an upgrade, the system detected there was an upgrade available and asked me if i wanted to download it so i clicked yes it started to download it as usual and i hadnt noticed anything wierd, then it was everithing the same a it was some weeks before with an other upgrade. But then when the computer had to reboot it got stuck at the point of turning the imac off, so I waited about half an hour thinking it was part ofthe upgrade. But I started warring as i read on the internet that it shouldnt take so long. So I picked up the imac instructions where i saw i couod turn it of by holding the power button for about 10 seconds. So thats what i did and it worked. Then i didnt have any problem till jet. Today my imac asied me again if i wanted to male the upgrade, so i clicked on later, cause i wanted to read about it before risking my selfe to hace that expierence again. So I continued using it normally for some hours untill I finally decidied to turn it off. And this time happened the same as the first time and i waited lots of minutes untill i decided to turn it off that ugly way again.
So i am starting to worry i have no idea what it is and what i might do. If anyone coild help me I would be more than gratefull with him.
Finally i wanted to apologized for spelling or grammar mistakes, then im on my iPod touch
Thank you very much for readig

You can turn off "Reopen windows when logging back in" by un-checking the box that appears when you shut down:
To check the updates that you installed go to System Preferences > Software Update, and check the tab "Installed Software":
Verify the last update was for Mac OS X. If it is something else, what was it?
... cause it might be that there was some program that would stop the computer to finish shutting herselfe down,
That is possible, but normally the program will cancel the shutdown with a dialog box identifying the program. Try this: next time you start the computer hold the ⌘ and V keys at the same time until you see a lot of white text on a black background. You can ignore it. After a moment your normal login screen will appear. Log in and use the computer normally. (This is called "verbose mode".)
When you shut down the opposite will happen: you will see white text appear as the shutdown sequence progresses. If a process is taking a very long time to terminate, you will have time to read the text that appears and write it down. If it is obvious what is taking so long, post the text that appears.

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