Bizarre memory problems with os 10.2.8

Hi there... i'm running 10.2.8 and have a problem! up until the other day i had around 3 gigs free... whilst my back was turned, my girlfriend scanned a bunch of images, and supposedly saved them on her hard drive via firewire. i'm not sure if that caused the problem, but next time i booted up i had 4 mb free on my drive.!! !! since then, i've tried to compress audio, throw things away, etc... but when i trash files, i often find that the amount of memory available goes DOWN instead of up! as if there was a copy being made of the file or something, instead of it being thrown away.
i keep getting an error (-51) from itunes when i try to turn an .aiff into an mp3...
i don't understand in the slightest what is happening and its driving me mad! currently i have 200mb free again, which is causing problems of its own. any advice?!
thanks,
will.

Well, it seems as though you're confusing memory with disk space; the two are completely different.
First, I would try using Disk Utility to Repair Disk, and then Repair Permissions. If it reports any errors during the Repair Disk process (noted in red), keep running it until no more errors are reported. If your girlfriend did this, what software was she using, and is that drive still connected to your Mac? If it is, disconnect it.
It's possible she saved these images on your hard disk and didn't delete them, so you need to look around. Do a Finder search of your hard disk for any visible files created or modified on that day that was whatever image format she was scanning them in as, or saving them to; it could be two different formats. If you find them, delete them.
As for OS X, one of your biggest problems, is that it requires at least 3 GB of free space, beyond all the other stuff you have on the drive, in order to work properly. If you don't have that, you need to get it somehow, even if it means moving applications or files off and/or getting a larger hard drive.
Until you deal with these other issues, don't import or try to convert any iTunes files. That can wait until later.
Hope this helps,
Mulder
If any of my answers helped solve your problem, please consider awarding some points. Why Reward Points?
iMac G4 700Mhz   Mac OS X (10.3.9)  

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