I have a DELL Precision M90. And having problems! What could it be?

I have a Dell Precision M90, T7600 Intel Core, 2 Duo processor. Processor speed 2.3 GHz, Memory 4GB, Harddrive 100 GB. I am using Windows Professional as my OS. It is only 3 months old. But lately it is running slow. Especially since I installed Norton Security Suites on it. I have wireless High speed Internet... show more I have a Dell Precision M90, T7600 Intel Core, 2 Duo processor.
Processor speed 2.3 GHz, Memory 4GB, Harddrive 100 GB. I am using Windows Professional as my OS. It is only 3 months old. But lately it is running slow. Especially since I installed Norton Security Suites on it. I have wireless High speed Internet through AOL. I contacted Dell as it is under warrenty, but they have not gotten back to me. Any ideas on what could be going on with it?
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