Your powersupply should be fine if you bought it prebuilt. Defragment your hard drive, run a spyware and adware scan, uninstall unneccesary programs, and delete files your dont need(music, videos etc.). If that noise is really bothering you, you can buy a new hdd.
EDIT: You can also buy new, quiter fans if the sound is bothering you that much.
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RIP Mom 9/17/55-02/22/08.
McCain/Palin 08'
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