HT1349 My I Mac won't start up after a failed software upgrade?

My computre stated that I had software updates.  I clicked the button to download and restart my computer.  A few minutes later the computer said that the downloads were unsuccessful and then froze up.  I have shut it down several times and when I restart the Apple logo appears and this little circle keeps going around and around.  I have let this go on far about 10 minutes each time but nothing happens. 
Any ideas as to what I can do?   

Did you use a geniune windows installation disc? I ask this because I worked on a computer today where someone had tried to use a Windows XP disc that came with a Dell computer. These do not work.
If it was a genuine install disc, did you get all the way through with the installation, or did something go wrong during the install?

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