HI,
Try
WhatSize
Probably a good idea to check the drive for errors. Restart your Mac while holding down the C key, pressing the power button and inserting your install disk all at the same time. An Installer window will open, but do not proceed with any installations. Instead, from the Menu Bar, select Utilities/Disk Utility. In the Disk Utility window click First Aid, and then click Verify. If Disk Utility reports errors, click Repair. When Disk Utility is finished, from the Menu Bar, select Utilities/Startup Disk. Select MacintoshHD 10.x.x and click Restart.
To check your hard disk’s S.M.A.R.T. status: Open Disk Utility, in the Utilities folder in the Applications folder.Select the disk in the list at the left, and look at the bottom of the window for a field named “S.M.A.R.T. Status.” *Make sure it says Verified. If not, it's probably an indication of drive failure.*
Freeing up space on the hard disk
Carolyn 🙂