Recently updated to Yosemite - now BIG problems

I have a 2010 Macbook - 2Gb Ram. I updated OS to Yosemite. Now everything runs painfully slow! I now hear lots of people are having problems with Yosemite and its Ram hungry so not a good idea on a Mac with just 2 Gb Ram. Can I go back to an older OS and if so which one should I chose? Simple answers please - Im not very techy.
Thanks

All Mac OS X versions from Lion through Yosemite specify 2 GB ram, but the OS X takes up 1.5 GB of that leaving very little for applications to use. One solution would be to increase your ram to 4 Gb or more by going to OWC, http://www.macsales.com or Crucial, http://www.crucial.com where you get quality, guaranteed ram.
Or, if you had Snow Leopard before the upgrade you can go back to that OS X. If you have a TimeMachine backup, simply startup on the install disk and erase the hard drive and restore from the TimeMachine backup.
See: OS X Yosemite: Revert to a previous OS X version
If there is no TM backup, startup on the Snow Leopard disk, select Disk Utility and erase the hard drive then Install Mac OS X.

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Did you ever get a solution to your problem? Because I am having the same problem. I was actually in the middle of using Word when the keyboard stopped working. But it works in other apps, including in Excel.
Thing is that my laptop just got back from Apple for repairs and they replaced everything but the display - including the hard drive.
So not only do I have plenty of hard drive space, but it should be virus and error free otherwise.
I have only installed a few programs and redownloaded some of my files from places like Dropbox, but otherwise is essentially a new system.
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This is a fresh install. And since I lost all my files, I only had like 1 old file I have downloaded from email and accessed and was in the process of
creating a new file when it crashed. I got no error, the keyboard just stopped working (to type). I also cannot even get Word > Preferences to even open,
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I did a Google search and under the Microsoft communities two suggestions to that person were that there may be multiple copies installed -
I have only the one - and that one is in the wrong place - again, I only have the one and it installed to the Hard drive (visible in Launchpad / Apps).
Another suggestion was that there was some problem with the updates. I ran updates and they installed fine. That helper suggested that the user
may have had different updates that worked for the other Office apps (Excel, PPT etc.) but not Word and that was at least part, if not all of his problem,
but all my Office apps show the same update version 12.3.6, so that cannot be the issue with me.
I've not yet tried uninstalling and reinstalling, but as I got no errors on the original install or updates, I'm not sure if that would fix it.
I've found that Mac just doesn't play nice with some programs at all.
And even though I have a factory installed version of Yosemite on a new, fresh hard drive, even when I booted up, my iPhoto app (which is empty) crashed. I am not sure if my iPhone or iPad was charging at the time, but I don't think so. iPhoto that I still have not even used has crashed several more times since, most notably when plugging in my iPhone / iPad to charge, namely when I declined to upload photos (by default) to DropBox. That may not be related at all, but thus far seems the only other problem I have encountered until this Word problem.
I'm on a MacBook Pro, Sept. 2009, running OS X Yosemite 10.10.1 factory installed from Apple repairs running Office: 2008 for Mac (Home and Student edition).
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<Re-Titled By Host>

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Recently updated to Yosemite - now BIG problems

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