[CheeToS2]

Maybe you accidently made the folder read-only, or you don't have write rights to the folder.

To check (might not be exactly the same, these are instructions for Win2k):

1) Go to C:\graal2001\maps\parts\
2) Right click on 'ol' and select Properties
3) Under 'Attributes', check if Read-only is checked. If it is, uncheck it.

If it isn't checked:
4) Click the Security tab (you will only see this if you are using XP Pro, not XP Home)
5) Make sure whatever username you are logged into on your computer has Full Control