Hard drive saying its full when it isn't

I'm having a problem where my hard drive is saying its almost full 54.31 used of 55.77 available which is making it run really slow. I recently cleared all my itunes onto an external hard drive to solve this problem and it did, meaning I had about 20 GB used. However it seems to have gone back up to 54 and I don't understand how? I run carbon copy cloner to mirror my hard drive and on the external it says only 20GB used?
I think another reason it is running slow is that my 1.5 GB RAM doesn't seem to be working. It was showing up as just 512, i opened it up, swapped the 512 card with the 1 GB card and now it says there is 1 GB only. I think the lower slot isn't working because I did an apple hardware test and it said so. It told me 'post/0/2048SO DIMMM0 / J25 lower. Is this a hardware problem or something wrong with the RAM? I am assuming the former because I managed to swap them around successfully. Does it need to be fixed professionally or is there anything else I can do? Can I use a 2GB card in one slot or doesn't this work?
Any help appreciate, my MAc isn't very happy at the moment!

After you moved the iTunes files to the external hard drive, did you trash the iTunes files on your internal drive?
Look at these links.
Where did my disk space go?
http://www.macfixitforums.com/showflat.php?Cat=&Board=Forum38&Number=770243
Download & use WhatSize described in this link or Disk Inventory X @ http://www.derlien.com/
Freeing space on your Mac OS X startup disk
http://www.thexlab.com/faqs/freeingspace.html
Amazing Disappearing Drive Space
http://www.pinkmutant.com/articles/TigerMisc.html
Increase HD Free Space
http://macosx.com/forums/howto-faqs/275191-how-easily-increase-hd-free-space-lap top.html
How to free up my disk space
http://www.macmaps.com/diskfull.html
Where Did My Disk Space Go?
http://www.macfixitforums.com/ubbthreads.php/ubb/showflat/Number/770243/site_id/ 1
 Cheers, Tom

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