The fan is almost always on and it is freezing up!

My macbook is running so slowly and it freezes constantly. Oddly enough, Word and Excel are the programs that give me the most trouble and I always have to Force Quit them because they freeze upon opening a document. Safari doesn't give me as much trouble but it is starting to more and more. The fan is always on when I am using it and when I put it to sleep the fan is still running for a while after. I don't know if I have a virus or if I should try to clean out some old stuff and delete them. (Started doing that just in case). I can't even get it to restart on its own! Help! It is kind of older, bought in 2008, but it hasn't been behaving like this until very recently.

Reset the PRAM and SMC. Google will find instructions to do this.
Use Onyx (again Google will find this) and run through its gamut of Verify, Maintenance and Cleaning steps.
Reboot
If still not resolved then check Login items: System Preferences > Accounts > Login Items tab.
Try disabling all of them (you can re-enable them later)
Logout and log back in again
If still not resolved there may a rogue task/process hogging the CPU. Start Applications/Utilities/Activity Monitor and see what activities are running. Click on the CPU heading to list tasks in order of increasing CPU usage.  If any appear to be hogging the system then kill them off.
Bob

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