Cleaning Harddrive Without Start Up Disc

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I have a 2007 MacBook Pro that is running on OS-X. I upgraded to the Leopard OS through my school, but I'm away and have no way to get a start up disc. I want to clear my harddrive of all programs except those needed to run and those that came with the OS. Reason being something is just eating my memory and I can't figure out what. I've tried going through and deleteing applications, but I know there are files I am missing that are still taking up space.
Would Apple's Genius bar be willing to help? I doubt it...
I do have Apple Care on my computer as well.
Let me know if anyone has a solution...
Thanks.
 

vansmith

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Reason being something is just eating my memory and I can't figure out what. I've tried going through and deleteing applications, but I know there are files I am missing that are still taking up space.
No need to reinstall OS X for this. Have you looked in Activity Monitor and seen what process is taking up memory? If something is taking up a noticeable amount of memory, it should be obvious in AM, especially if you sort by memory usage.
 
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I just noticed that FireFox utilizes a lot of RAM memory -- 128MB; Safari only uses around 19MB, wow.

@cboyk, when running Activity Monitor, click on the "Real Memory" tab so you get highest ram usage to lowest, or vice versa.
 

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