I have same problem as OS X yers made my computer very slow. and i don't see any advantage so for

Hi every one.
I have 2.4 GHz Intel Core 2 Duo makbook. I upgraded to os x yersme. Now I am stuck and wondering why i did this as it made my computer very slow. stating time increased, some feature disappeared and I cannot save document In my hard drive using office. I do not want this any more. but the problem is i forgot my old software name. is any one know which would be that preinstalled software name. B. how can i go back to it with less hassle as I am not much of computer person.
thanks

Activity Monitor - Mavericks  also Yosemite
Activity Monitor in Mavericks has significant changes
Performance Guide
Why is my computer slow
Why your Mac runs slower than it should
Slow Mac After Mavericks
Things you can do to resolve slowdowns  see post by Kappy
6 Easy Tips to Speed Up OS X Yosemite on Your Mac
Do a backup, preferably 2 separate ones on 2 separate drives.
Revert to a Previous OS X - Yosemite
Revert Yosemite to Mavericks
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.

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        MacBook Pro (15-inch, Mid 2012) (Technical Specifications)
        MacBook Pro - model: MacBookPro9,1
        1 2.3 GHz Intel Core i7 CPU: 4-core
        4 GB RAM Upgradeable
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            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
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