I upgraded my memory to 8 GB and now my computer is slow.  Programs are not responding.  I previouly had 3 GB but i went to Mountain ion so i thought it might be wise to increase memory.  What could be the problem.

this is my first time asking a question so I don't know how to follow response. 

Well, Macs are extremely finicky about their RAM (and different models need different spec RAM).
Can you check your model identifier please, so we can figure out if they sold you the exact spec RAM that your particular model needs? You can go here:
http://eshop.macsales.com/shop/apple/memory/iMac
and follow their directions on how to find your model identifier. Once you're figured that out, please post it here so we can check on the exact specs needed. Your RAM should say more than what you mentioned. On my iMac, this is what it says:
I don't know of any recent iMac that has DDR2, but I could be wrong there.,  Yours doesn't list the speed either (1333 MHz on mine).

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    Report generated April 5, 2015 at 9:42:01 AM PDT
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    Click the [Click for details] links for more information about that line.
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            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
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        MATSHITADVD-R   UJ-898
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        Apple Inc. Apple Internal Keyboard / Trackpad
        Apple Inc. BRCM2070 Hub
            Apple Inc. Bluetooth USB Host Controller
        Apple Inc. FaceTime HD Camera (Built-in)
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        Apple Inc. thunderbolt_bus
    Gatekeeper: ℹ️
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    Launch Agents: ℹ️
        [not loaded]    com.google.keystone.agent.plist [Click for support]
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        [not loaded]    com.logmein.logmeingui.plist [Click for support]
        [not loaded]    com.logmein.logmeinguiagent.plist [Click for support]
        [not loaded]    com.logmein.logmeinguiagentatlogin.plist [Click for support]
    Launch Daemons: ℹ️
        [not loaded]    com.adobe.fpsaud.plist [Click for support]
        [not loaded]    com.google.keystone.daemon.plist [Click for support]
        [not loaded]    com.logmein.logmeinblanker.plist [Click for support]
        [not loaded]    com.logmein.logmeinserver.plist [Click for support]
        [not loaded]    com.logmein.raupdate.plist [Click for support]
        [not loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
    User Launch Agents: ℹ️
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        [not loaded]    com.facebook.videochat.[redacted].plist [Click for support]
        [not loaded]    com.google.GoogleContactSyncAgent.plist [Click for support]
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        AdobeResourceSynchronizer    Application Hidden (/Applications/Adobe Reader.app/Contents/Support/AdobeResourceSynchronizer.app)
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        LogMeInSafari64: Version: 1.0.660 [Click for support]
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        FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
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        Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
        LogMeInSafari32: Version: 1.0.660 [Click for support]
        QuickTime Plugin: Version: 7.7.3
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    3rd Party Preference Panes: ℹ️
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             4%    WindowServer
             1%    kextd
             0%    ps
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        137 MB    Microsoft Word
        120 MB    Safari
        86 MB    ocspd
        82 MB    CalendarAgent
        77 MB    WindowServer
    Virtual Memory Information: ℹ️
        310 MB    Free RAM
        1.89 GB    Active RAM
        1.55 GB    Inactive RAM
        544 MB    Wired RAM
        1.13 GB    Page-ins
        8 KB    Page-outs
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        Apr 5, 2015, 09:32:47 AM    Self test - passed
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