My mac is running slow. How can I fix this issue?

Hi,
My Mac has been running very slow for quite some time now. It takes a very long time to load a window and it freezes at times. Does this mean that I have a virus? If so, how can I fix this issue? Can you suggest a good and inexpensive spyware software? I appreciate any help that you can provide.
Thank you,
Pita-Gay

Hi P,
Run Verify/Repair Disk.
You should have at least 15% free space available on your HD; if not, need to delete some things.
You may need more RAM. One way to get an idea whether more RAM will help or not, is to check Page outs and Swap used. First, use your Mac as you normally would, the longer the better (checking this right after starting up isn’t likely to show you anything). After you’ve used your Mac for awhile (again, the longer the better), go to Applications > Utilities > open Activity Monitor > in the top menu at right, select All Processes in the drop down menu > near the bottom of the window click on System Memory. If Page outs is more that about 10% of Page ins, and/or Swap used is large, chances are good that adding RAM will help. http://support.apple.com/kb/HT1342

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          MacBook Pro - model: MacBookPro7,1
          1 2.66 GHz Intel Core 2 Duo CPU: 2 cores
          4 GB RAM
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                    Macintosh HD (disk0s2) / [Startup]: 319.21 GB (92.21 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
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          Apple Inc. Built-in iSight
          Apple Internal Memory Card Reader
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Computer, Inc. IR Receiver
          Apple Inc. Apple Internal Keyboard / Trackpad
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          [not loaded] com.macpaw.CleanMyMac.volumeWatcher.plist Support
          [loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist Support
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          AdobeResourceSynchronizer
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          AdobePDFViewer: Version: 10.1.9 Support
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          OfficeLiveBrowserPlugin: Version: 12.3.6 Support
          Unity Web Player: Version: UnityPlayer version 3.1.0f4 Support
          Silverlight: Version: 5.1.20913.0 - SDK 10.6 Support
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          AirPlay: Version: 2.0 - SDK 10.9
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               1%          Safari
               0%          fontd
               0%          hidd
               0%          mds
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