Ok. Then this is what I want you to do.
Insert the install disk #1 into the CD drive.
Turn off the MacBook by pressing the power button.
Then start it up and press and hold the 'C' key.
Do not let go until you see the window that asks what language you want to use.
Click continue to the next page and at the top of the screen you will see menu items.
Click on Utilities and select Disk Utility.
The picture below will show you how to repair the permissions.
Do this and then quit Disk Utility and quit the installer to restart the MacBook.
As soon as the screen turns black press and hold these 4 keys.
'Apple' (same as command, the one between option and space)
Wait for 4 start up chimes then let go and let it start normally.
Please let me know the results.