Mountain Lion Running VERY SLOW on Late 2009 iMac

Question

Specs are all good. There's enough disc space, memory etc... Not too many start up items...
But STILL... My system is BUGGY and VERY SLOW!
I've done a clean install and to no avail... I am constantly getting the spinning wheel with every action I take.
For now, all I can do is be extremely patient and not keep pushing the system... I let it do its thing.
Something is not happy.

Answer 1

Thank you for the repy ETRESOFT!
Not sure why the screen shots aren't showing up? They even came up on iPad while viewing your post? Sorry about that.
Okay... After running your diagnostic program, (THANK YOU AGAIN)  here's what we find...
It looks like there's a S.M.A.R.T. failure. (SEE BELOW)
I'm not sure if I should completely wipe the hard drive, attempt utility disk repair and reinstall everything? Would it benefit?
Last week when I was prepared to install Mountain Lion for the first time, I called APPLE Support and they advised me to do the following for a fresh & clean install:
Completely erase the iMac hard drive.
Download and Install a fresh copy of Lion
Set up TEMP USER as default ADMIN
Upgrade to Mountain Lion
Add a 2nd user Chipo1973 with ADMIN Rights
Migrate backup copy of Chipo73 from MacBook Pro onto user Chipo1973 / iMac
Delete original TEMP USER
Not sure if this caused any additional issues?
Thoughts?
EtreCheck Results:
Hardware Information:
          iMac - model: iMac10,1
          1 3.06 GHz Intel Core 2 Duo CPU: 2 cores
          16 GB RAM
System Software:
          OS X 10.8 (12A269) - Uptime: 0 days 0:43
Disk Information:
          ST31000528ASQ disk0 : (1 TB)
          S.M.A.R.T. Status: Failing
                    disk0s1 (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 999.35 GB (734.61 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          OPTIARC DVD RW AD-5680H 
USB Information:
          Apple Internal Memory Card Reader
          Apple Inc. Built-in iSight
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Logitech USB Receiver
          BLUE MICROPHONE Blue Snowball 
          Apple Computer, Inc. IR Receiver
FireWire Information:
Kernel Extensions:
          com.globaldelight.driver.BoomDevice          Version: 1.1
          com.vara.driver.VaraAudio          Version: 1.0.3
Problem System Launch Daemons:
                 [failed] com.apple.xprotectupdater.plist  
Problem System Launch Agents:
                 [failed] com.apple.afpstat.plist
Launch Daemons:
                 [loaded] com.adobe.fpsaud.plist
                 [loaded] com.adobe.SwitchBoard.plist
             [not loaded] com.embraceware.awaken.plist
                 [loaded] com.freemacsoft.appcleanerdaemon.plist
                 [loaded] com.google.keystone.daemon.plist
             [not loaded] com.klieme.TimeMachineScheduler.plist
                 [loaded] com.microsoft.office.licensing.helper.plist
                 [loaded] com.parallels.desktop.launchdaemon.plist
             [not loaded] com.teamviewer.teamviewer_service.plist
                 [loaded] com.timesoftware.timemachineeditor.backupd-auto.plist
                 [loaded] org.macosforge.xquartz.privileged_startx.plist
Launch Agents:
             [not loaded] com.adobe.AAM.Updater-1.0.plist
                 [loaded] com.adobe.CS5ServiceManager.plist
                 [loaded] com.google.keystone.agent.plist
                 [loaded] com.Logitech.Control Center.Daemon.plist
                 [loaded] com.parallels.desktop.launch.plist
                 [loaded] com.parallels.DesktopControlAgent.plist
                 [loaded] com.parallels.vm.prl_pcproxy.plist
             [not loaded] com.teamviewer.teamviewer.plist
             [not loaded] com.teamviewer.teamviewer_desktop.plist
                 [loaded] org.macosforge.xquartz.startx.plist
User Launch Agents:
                 [loaded] ca.madefresh.BodegaAgent.plist
                 [loaded] com.adobe.AAM.Updater-1.0.plist
             [not loaded] com.adobe.ARM.df0ab5bbe6f698196fcc21e3c1e66dcb758bd911f4d637272d9d8109.plist
                 [loaded] com.divx.agent.postinstall.plist
                 [loaded] com.microsoft.LaunchAgent.SyncServicesAgent.plist
                 [loaded] de.metaquark.appfresh.plist
User Login Items:
          Capster
          Boom
          BumpTop
          LaunchBar
          Forismatic
          MenuWeather Lite
          Microsoft Outlook
          CleanMyDrive
          AdobeResourceSynchronizer
          AdobeResourceSynchronizer
3rd Party Preference Panes:
          DivX
          Flash Player
          Flip4Mac WMV
          Logitech Control Center
          MacFUSE (Tuxera)
          MagicPrefs
          Perian
          TimeMachineScheduler
Internet Plug-ins:
          AdobeAAMDetect.plugin
          AdobePDFViewer.plugin
          AdobePDFViewerNPAPI.plugin
          CANONiMAGEGATEWAYDL.plugin
          CANONiMAGEGATEWAYLI.plugin
          CouponPrinter-FireFox_v2.plugin
          DirectorShockwave.plugin
          DivXBrowserPlugin.plugin
          EPPEX Plugin.plugin
          Flash Player.plugin
          FlashPlayer-10.6.plugin
          Flip4Mac WMV Plugin.plugin
          Google Earth Web Plug-in.plugin
          googletalkbrowserplugin.plugin
          iPhotoPhotocast.plugin
          JavaAppletPlugin.plugin
          npgtpo3dautoplugin.plugin
          npTGEQPlugin.plugin
          OfficeLiveBrowserPlugin.plugin
          OVSHelper.plugin
          QuickTime Plugin.plugin
          SharePointBrowserPlugin.plugin
          Silverlight.plugin
User Internet Plug-ins:
Bad Fonts:
          None
Top Processes:
          7.0   %          Safari
          2.6   %          WindowServer
          1.1   %          EtreCheck
          0.7   %          WebProcess
          0.7   %          coreaudiod
          0.4   %          BumpTop
          0.4   %          Boom
          0.3   %          mds
          0.2   %          prl_disp_service
          0.2   %          SystemUIServer