My computer may be invaded by having opened up a bad e-mail.  What can i do do debug my imac.  Thank you

My friend aleted me his computer was "spammed" and to not open up a certain e-mail.  Sadly i did and now my IMAC leopard is acting badly.  Can i get this straightened out myself without taking it in?  Thank you

Your computer is very secure however using a little common sense is the best protection. Never download and install anything unless you know what it is first or if it comes from a trusted source. If you get a popup on your screen telling you to download load something then be very suspicious and research what is being suggested.
As for the spinning beach ball that can be caused by many things, the most common is the computer needs a RAM upgrade or you have some process that dominating the computer's CPU. You can run Activity Monitor (Applications - Utilities - Activity Monitor) and check to see how much FREE RAM it has (click the System Memory tab) and also look in the column that lists the processes being run to see if anything is using a lot of %CPU. As a rule of thumb if the FREE RAM is 500MB or less then you would probably benefit by upgrading the RAM. If you see a process using a large %CPU then quit the process. 
Here is an article that explains more about the SSBBOD
Spinning Beach Ball of Death

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